By rethinking the way our products are designed and changing the way we use plastics, we can tackle the blight of marine litter and the general accumulation of plastic waste. But, as Professor Richard Thompson said in our latest SCItalk, systemic issues and historical excesses have made this no easy task.
Contrary to popular perception, plastic is not the villain. When it comes to marine littering, we are the ogres, with our single-use bottles bobbing in the oceans and the detritus of our everyday lives littering the coastline.
We are the reason why 700 species are known to encounter plastic debris in the environment. It is because of us that plastics have beaten us to the bottom of the deepest oceans and glint in the sun near the summit of Mt. Everest.
According to Richard Thompson, of the Marine Institute School of Biological and Marine Sciences at the University of Plymouth: ‘Plastic debris is everywhere. Its quantity in the ocean is likely to triple between 2015 and 2025.’
As Professor Thompson pointed out all of these facts to his audience in our latest SCItalk on 23 March, he outlined potential solutions. However, there is no ignoring the depth of the issues at hand when it comes to the litter in our seas.
Society has gradually woken up to the menace of discarded plastics and, laterally, to the threat of microplastics and nanoplastics. The problem is that we left the barn door open decades ago. So, all of those plastic microbeads from shower gels, fibres from clothing, and tyre wear particles polluted our seas for many years before it came to public and scientific attention.
Professor Thompson said that 300 papers were published globally on microplastics in the last academic year alone, but research in the area was relatively thin on the ground before Thompson and his colleagues released their pioneering study on microplastics in Science in 2004.
‘The business model for the use of plastics hasn’t really changed since the 1950s,’ Professor Thompson said. According to him, we have had 60 years of behavioural training to just throw products away, and our waterways reflect this attitude.
According to Professor Thompson, 50% of shoreline litter items recorded during the 2010s originated from single-use applications. Without a sea change in our attitude towards single-use items, this problem will persist.
Microplastics have been subject to great scrutiny, but much of the research is quite recent.
The problems with larger plastics and even microplastics are now well documented. The worrying thing, according to Thompson, is that there are knowledge gaps when it comes to nanoplastics in the natural environment. What are the effects of nanoplastic ingestion? What are the effects of human health? Time will tell, but Thompson was keen to ask if we really need that information before we take action.
He was more sanguine about the effects of microplastics. ‘The concentration of microplastics is probably not yet causing widespread ecological harm,’ he said, ‘but if we don’t take measures, we’ll pass into widespread ecological harm within the next 50-100 years.’
It seems counterintuitive to think of petrochemical plastics as a sustainable solution; and yet, despite the environmental problems posed by their durability, they do have a role to play in a greener approach.
‘If used responsibly, plastics can reduce our footprint on the planet,’ Thompson noted. Indeed, the lightweight plastic parts in our cars and in aviation can actually help reduce carbon emissions. But despite their merits, how do we keep plastic litter from our seas?
To illustrate a flaw in the way we design plastic products, Professor Thompson gave the example of an orange coloured drinks bottle. While the bright colour may help sell juice drinks, there is an issue with recycling these coloured plastics because their value as a recyclate is lower. Clear plastics, on the other hand, are much more viable to recycle.
He argues that many products aren’t being designed with the whole lifecycle in mind. ‘We’re still failing to get to grips with linking design to end of life,’ he said, before highlighting the importance of communicating how products should be disposed of right from the design stage.
Basically, our products should be designed with end of life in mind. ‘If we haven’t even designed a plastic bottle properly,’ he lamented, ‘what hope do we have with something that’s more complicated?’
Those brightly coloured plastic bottles look nice and fancy, but they can be challenging to recycle in a circular economy.
Professor Thompson argued that better practices are needed to help divert materials away from our seas (and it should be noted that there are other types of discarded materials to be found there). If we recycle greater quantities of end of life plastic products and bring them into a circular economy, he said, ‘we’d decouple ourselves from oil and gas as the carbon source for new production because the carbon source we use would be the plastic waste’.
He said more could also be done with labelling so that customers know whether, for example, a product is compostable and which waste stream it needs to be placed in to achieve that. He also noted that addressing our single-use culture would be a good place to start if we want to change the business model of linear use.
The good news is that there is an appetite for change. ‘Ten years or so ago there was no consensus that there was a problem,’ Thompson noted. ‘I would argue that this has changed.’ However, he also feels that it is essential to gather reliable, independent evidence to inform interventions, rather than espousing solutions that could make things worse.
‘We need to gather that evidence from different disciplines,’ he said. ‘We need to have at the table product designers and couple them with the waste managers. We need to have economists at the table. We also need to bring in social scientists to look at behaviour. We’ve got to think about this in the round.’
He also felt that policy measures – such as mandating recycled content – could be a good option, along with better design and disposal.
The tools we need to tackle plastic pollution are already at our disposal. We just need to act more responsibly – which, unfortunately, has been part of the problem all along.
As Professor Thompson said: ‘It’s not the plastics per se that are the problem – it’s the way we’ve chosen to use them.’
>> For more interesting SCI talks like Professor Thompson’s, check out our YouTube channel.
>> Find out more about the work of Professor Thompson and his colleagues here: https://www.plymouth.ac.uk/research/marine-litter.
Crop rotation, seaweed extracts, lime, and a range of organic materials can all improve soil health and crop yields. Professor Geoff Dixon shows you several ways to improve your soil.
Rapidly rising costs of living are affecting all aspects of life. Increasing costs of fertilisers are affecting food production, both commercially and in gardens and allotments.
Wholesale prices of fertilisers have jumped four-fold from £250 to £1,000 per tonne within six months. All forms of garden fertilisers are now much more expensive. Crops, especially vegetables, only thrive if provided with adequate nutrition (see nitrogen-deficient lettuce below). Consequently, fertiliser use must become more efficient.
Nitrogen deficiency in lettuce.
Healthy, fertile soils achieved through good management are key to this process. That ensures roots can take up the nutrients needed in quantities that result in balanced, healthy growth.
Soil pH is a major regulator of nutrient availability for roots. Between pH 6.5 to 7.5, the macro nutrients, nitrogen, phosphorus, and potassium are fully available for root uptake. Below and above these values, nutrient absorption becomes less efficient.
>> How much soil cultivation do you need for your vegetables? Find out more in Prof Dixon's blog on cultivation.
As a result, soluble nutrients are wasted and washed by rainfall below the root zones. Acidic soils can be improved by liming in the autumn. Sources of lime derived from crushed limestone require up to six months to cause changes in soil pH values. Lime should be used in ornamental gardens with caution as it can result in micronutrient deficiencies.
Iron deficiency in wisteria.
Soil health and fertility are greatly increased by adding organic materials such as farmyard manure and well-made composts. Increasing soil carbon content helps mitigate climate change while raising fertiliser use efficiencies.
Beneficial soil biological life such as earthworms, insects, benign bacteria and fungi are greatly encouraged when you increase soil humus content. Using crop rotations, which include legumes, raises natural levels of soil nitrogen. This is a result of legumes’ symbiotic relationships with nitrogen-fixing bacteria.
Leafy vegetables such as brassicas require large amounts of nitrogen and, hence, should follow legumes in a rotation. Avoiding soil compaction encourages adequate aeration, benefiting root respiration and providing oxygen for other organisms.
Organic materials are of great value in ornamental gardens when applied as top dressings in late autumn or early spring. This provides two benefits: a slow release of nutrients into the root zones as decomposition occurs, and prevention of weed growth.
Inorganic fertiliser use can be further minimised by using proprietary seaweed extracts. These contain macro- and micro-nutrients plus several natural biostimulant compounds that aid healthy ornamental plant growth and flowering (illustration no 3 rose Frűhlingsgold).
Written by Professor Geoff Dixon, author of Garden practices and their science.
We always hear about athletes eking out that competitive edge through subtle changes in diet or equipment. Well, when it comes to making our buildings more energy-efficient, dozens of different technologies could make a difference. Every one may not be earth juddering on its own, but each could help decarbonise our homes by degrees.
Phase-changing materials (PCMs) may have a role to play in reducing our reliance on power-hungry cooling and heating systems in the home. At Texas A&M University, researchers have developed PCMs to passively regulate temperatures inside buildings.
They believe their 3D-printed phase-change materials - compounds that can change from a solid to liquid when absorbing heat, or from liquid to solid when releasing heat - could be incorporated into our homes in paint or other interior effects to regulate interior temperatures.
New phase-change material composites can regulate ambient temperatures inside buildings | Image credit: Texas A&M University College of Engineering
Their partial substitute to the heating, ventilation and air conditioning (HVAC) systems that predominate in many of our buildings is a light-sensitive liquid resin with a phase-changing paraffin wax powder.
According to the researchers, their 3D printable ink composite improves upon existing PCMs in that it doesn’t require a separate shell around each PCM particle. When the PCM is mixed with liquid resin, the resin acts as both the shell and building material, enabling thermal energy management without any leakage. They use an ultraviolet light to solidify their 3D printable paste and make it suitable for use in our buildings.
“The ability to integrate phase-change materials into building materials using a scalable method opens opportunities to produce more passive temperature regulation in both new builds and already existing structures,” said Dr. Emily Pentzer, associate professor in the Department of Materials Science and Engineering and the Department of Chemistry.
To date, the researchers have only tested their materials on a small scale in a house-shaped model. Nevertheless, after placing their 3D printed model inside an oven, the results were encouraging. The model’s temperature was 40% different to outside temperatures compared to models made using traditional materials.
From solar panels and insulation to heat pumps and phase change materials, much has been done to make our homes more energy-efficient
“We’re excited about the potential of our material to keep buildings comfortable while reducing energy consumption,” said Dr. Peiran Wei, research scientist in the Department of Materials Science and Engineering and the Soft Matter Facility. “We can combine multiple PCMs with different melting temperatures and precisely distribute them into various areas of a single printed object to function throughout all four seasons and across the globe.”
Perhaps we won’t see PCMs in widespread use in our buildings any time soon, but it’s always heartening to see the use of passive heating and cooling systems in our buildings. Anything that contributes to the decarbonisation mix is certainly worth investigating further.
Think of Earth as an apple and the soil as the peel. Now, imagine that more than 70% of this apple’s surface is covered in water. That veneer of peel suddenly seems very small indeed.
Dig beneath the surface and you realise that the world’s soil resources aren’t as plentiful as you first thought. When you take into account all of the uninhabitable, non-arable land on our planet, including the snow-bound poles and deserts, you’re left with just 3% of total landmass to grow all the fruit and vegetables we eat.
After reminding her listeners of some stark facts at the Soil resources in the UK: overlooked and undervalued? webinar, Jane Rickson, Professor of Soil Erosion and Conservation at Cranfield University, reminded us that soil is a precious, finite resource. “We’re dealing with a very thin resource that has to deliver all of these goods and services.”
You just need to think of your breakfast, lunch, and dinner to realise just how important soil is. Of all the food we eat, 97% comes from terrestrial sources. However, in recent decades, the many benefits brought by soil have been taken lightly. Apart from providing food, animal fodder, and a surface for football, it plays a vital role in climate change mitigation.
‘Soil is excellent for climate change mitigation,’ said Professor Rickson, recipient of the prestigious Dr Sydney Andrew Medal for 2021. ‘We know that healthy soils can support vegetation and crops and plants in taking out atmospheric CO2.’
A cross section of soil layers. Unless you live on fish and seaweed, it’s likely that almost all of your food sources will come from terrestrial sources.
However, she and her colleagues at Cranfield University have unearthed some unsettling facts about the state of our soils. She mentioned that 12 million hectares of agricultural land worldwide is lost each year due to soil degradation. In the UK, soil erosion rates can be as high as 15 tonnes per hectare per year, with soil formation rates only compiling at a rate of 1 tonne per hectare per year; and, based on current rates of erosion, some soils could disappear completely by 2050.
So, what is being done to arrest this problem? The obvious mammoth in the room is climate change, with extreme weather events such as flash floods precipitating a huge amount of soil erosion. Obviously, climate change mitigation measures on a national scale would help, but adjustments to farming practices could also improve soil resilience on a more local level.
A lot of work is also being done to reduce the intensity of farming to improve soil health. The aim, according to Rickson, is to maintain a fertile seedbed while retaining maximum resistance to soil degradation. There are lots of different ways to do this.
One approach being taken is cover cropping, whereby a crop is grown for the protection and enrichment of the soil rather than for immediate sale. This enriches the soil and helps prevent soil erosion. Another approach is strip-tillage – a minimum tillage system that disturbs only the portion of the soil that contains the seed row, with the soil between rows left untilled. She also mentioned the benefits of soil improvement, with poultry manure and mushroom compost used to improve soil health by Benedict Unagwu among others.
Cover crops such as vetch and oats improve the structure and fertility of the soil.
It is difficult not to have sympathy for farmers at the moment. Climate change falls heavily upon their lands, and they must battle flooding and drought to keep their farms financially viable. Professor Rickson often speaks to the farming community about soil health, with the focus placed on realistic solutions. As one farmer told her: ‘It's hard to be green when you’re in the red.’
Perhaps soil doesn’t capture the imagination the same way as an oak forest or a field ablaze with wildflowers, but its mismanagement is costing us a fortune. She estimated that the combined annual economic cost of soil degradation in England, Scotland, and Wales is £1.5 billion.
According to Professor Rickson, the US is probably the home of soil conservation following the harsh ecological lessons learnt from the Dust Bowl disaster of the 1930s. However, she believes the UK has plenty of knowhow in the area.
‘The UK has an opportunity to be world-leading in this,’ she said. ‘I think we are as good as anyone. Our scientific community understands soil and is really pushing the boundaries in terms of soil science.’
We’re starting to see those silent cars everywhere. The electric vehicle evolution is gradually seeping onto our roads. Every month or two, we also seem to read about another wind power generation record in the UK, or some super solar cell. Pension funds and big corporations are coming under great pressure to divest from fossil fuels. The clean power revolution is well underway.
And yet the third biggest polluter of the planet - after power and transport - awaits the seismic shift that will shake it to its foundations. Indeed, cement production still accounts for roughly 8% of the world’s greenhouse gas emissions.
The problem is that creating cement is an energy-intense, polluting process with firing temperatures of 2,700 degrees Fahrenheit needed to create it, and plenty of CO2 released during processing.
Green cement and concrete are needed to reduce emissions in construction and other industries.
But there are signs that the processing could become cleaner. A recent report released by Market Research Future (MRFR) predicts that concrete (of which cement is a key ingredient) use could get appreciably greener over the next six years. It estimates that the global green concrete market size will grow at a 9.45% compound annual growth rate from 2020-27.
MRFR attributes this rise to several factors. First, there is a growing demand for green or recycled concrete (that incorporates waste components) within the construction industry. For builders, it enhances their environmental credentials and will increasingly become a business-savvy investment as governments seek to reduce carbon emissions.
Green building codes and the creation of energy-efficient infrastructure will also help propel this growth, and changing building regulations in massive markets including China, India, and the Middle East will result in many manufacturers looking to develop different material combinations. Increasingly, we’re seeing manufacturers turning to less energy-intensive manufacturing methods and investigating which waste materials could be used to create a greener cement or concrete that doesn’t compromise on performance.
Researchers at Chalmers University of Technology, in Sweden, have even been developing a rechargeable cement-based battery. If it ever comes to pass, this could be used to create buildings that store energy like giant batteries. Some manufacturers are also looking into the electrification of kilns, which isn’t feasible yet, and carbon capture and storage has long been mooted as a means to reduce industrial emissions.
Imagine an entire twenty storey concrete building that can store energy like a giant battery. This could be possible if Chalmers University’s cement-based rechargeable batteries come to fruition. | Image Credit: Yen Strandqvist/Chalmers University of Technology
The good news is that we don’t just have people all over the world working on low-carbon materials and manufacturing methods; experts in the UK are tackling the issue right now. On 2 June, speakers at the SCI’s free webinar, Ultra-low carbon concrete, a sustainable future, will examine some of the exciting initiatives underway.
These include an award winning, industry accepted ultra-low carbon alternative to traditional cement, which could result in CO2 savings of up to 78%, and the potential of using offsite manufacturing to provide commercial projects with a sustainable structural frame solution.
As with transport and power, cement is getting greener increment by increment. But with drastic climate change consequences dangling above us like the Sword of Damocles, now is the time for concrete action.
Register for Ultra-low carbon concrete, a sustainable future today at: https://bit.ly/33WfjkN.
Sometimes, when you try to solve one problem, you create another. A famous example is the introduction of the cane toad into Australia from Hawaii in 1935. The toads were introduced as a means of eliminating a beetle species that ravaged sugar cane crops; but now, almost a century later, Western Australia is inundated with these venomous, eco-system-meddling creatures.
In a similar spirit, disposable face masks could help tackle one urgent problem while creating another. According to researchers at Swansea University, nanoplastics and other potentially harmful pollutants have been found in many disposable face masks, including the ones some use to ward off Covid-19.
After submerging various types of common disposable face masks in water, the scientists observed the release of high levels of pollutants including lead, antimony, copper, and plastic fibres. Worryingly, they found significant levels of pollutants from all the masks tested.
Microscope image of microfibres released from children's mask: the colourful fibres are from the cartoon patterns | Credit: Swansea University
Obviously, millions have been wearing single-use masks around the world to protect against the Covid-19 pandemic, but the release of potentially harmful substances into the natural environment and water supply could have far-reaching consequences for all of us.
‘The production of disposable plastic face masks (DPFs) in China alone has reached approximately 200 million a day in a global effort to tackle the spread of the new SARS-CoV-2 virus,’ says project lead Dr Sarper Sarp, whose team’s work has been published on Science Direct. ‘However, improper and unregulated disposal of these DPFs is a plastic pollution problem we are already facing and will only continue to intensify.
The presence of potentially toxic pollutants in some face masks could pose health and environmental risks.
‘There is a concerning amount of evidence that suggests that DPFs waste can potentially have a substantial environmental impact by releasing pollutants simply by exposing them to water. Many of the toxic pollutants found in our research have bio-accumulative properties when released into the environment and our findings show that DPFs could be one of the main sources of these environmental contaminants during and after the Covid-19 pandemic.’
The Swansea scientists say stricter regulations must be enforced during manufacturing and disposal of single-use masks, and more work must be done to understand the effect of particle leaching on public health and on the environment. Another area they believe warrants investigation is the amount of particles inhaled by those wearing these masks.
‘This is a significant concern,’ adds Sarp, ‘especially for health care professionals, key workers, and children who are required to wear masks for large proportions of the working or school day.’
Every tin can dropped into our recycling bins is a small act of faith. We hope each one is recycled, yet the figures take some of that fervour from our faith. According to UK government statistics from 2015-2018, only about 45% of our household waste is recycled. Similarly, the UN has noted that only 20% of the 50 million tonnes of electronics waste produced globally each year is formally recycled. So, it’s fair to say we could do better.
Thankfully, thousands of people around the globe are working on these problems and two recent developments give us grounds for optimism. The first involves upcycling metal waste into multi-purpose aerogels, and the second involves fully recyclable printed electronics that include a wood-derived ink.
Researchers at the National University of Singapore (NUS) claim to have turned one person’s trash into treasure with a low-energy way to convert aluminium and magnesium waste into high value aerogels for the construction industry.
To do this, they ground the metal waste into a powder and mixed it with chemical cross-linkers. They heated this mixture in an oven before freeze-drying it and turning it into an aerogel. The team says this simple process makes their aerogels 50% cheaper than commercially available silica aerogels.
Aerogels have many useful properties. They are absorbent, extremely light (hence the frozen smoke nickname), and have impressive thermal and sound insulation capabilities. This makes them useful as thermal insulation materials in buildings, in piping systems, or for cleaning up oil spills. However, the NUS team has loftier goals than that.
There is a great need for less energy intensive ways to recycle metals
“Our aluminium aerogel is 30 times lighter and insulates heat 21 times better than conventional concrete,” research team leader Associate Professor Duong Hai-Minh whose research has been published in the Journal of Material Cycles and Waste Management. “When optical fibres are added during the mixing stage, we can create translucent aluminium aerogels which, as building materials, can improve natural lighting, reduce energy consumption for lighting and illuminate dark or windowless areas. Translucent concrete can also be used to construct sidewalks and speed bumps that light up at night to improve safety for pedestrians and road traffic.”
The aerogels could even be used for cell cultivation. Professor Duong explains: “Microcarriers are micro-size beads for cells to anchor and grow. Our first trials were performed on stem cells, using a cell line commonly used for testing of drugs as well as cosmetics, and the results are very encouraging.”
Whatever about these speculative applications, this upcycling method will hopefully help us find new homes for all types of metal waste including metal chips and discarded electronics.
A team at Duke University has also made interesting progress in reducing electronic waste. The researchers claim to have developed fully recyclable printed electronics that could be used and reused in a wide range of sensors.
The researchers’ transistor is made from three carbon-based inks that can be printed onto paper, and their use of a wood-derived insulating dielectric ink called nanocellulose helps make them recyclable. Carbon nanotubes and graphene inks are also used for the semiconductors and conductors, respectively.
A 3D rendering of the first fully recyclable, printed transistor. CREDIT: Duke University
“Nanocellulose is biodegradable and has been used in applications like packaging for years,” said Aaron Franklin, the Addy Professor of Electrical and Computer Engineering at Duke, whose research has been published in Nature Electronics. “And while people have long known about its potential applications as an insulator in electronics, nobody has figured out how to use it in a printable ink before. That’s one of the keys to making these fully recyclable devices functional.”
The team has developed a way to suspend these nanocellulose crystals (extracted from wood fibres) with a sprinkling of table salt to create an ink that performs well in its printed transistors. At the end of their working life, these devices can be submerged in baths with gently vibrating sound waves to recover the carbon nanotubes and graphene components. These materials can be reused and the nanocellulose can be recycled just like ordinary paper.
The team conceded that these devices won’t ruffle the trillion dollar silicon-based computer component market, but they do think these devices could be useful in simple environmental sensors to monitor building energy use or in biosensing patches to track medical conditions.
Read about the Duke University research here: https://www.nature.com/articles/s41928-021-00574-0
Take a look at the NUS study here: https://link.springer.com/article/10.1007/s10163-020-01169-1
To some, the almond is a villain. This admittedly tasty nut takes an extraordinary amount of water to grow (1.1 gallons per nut) and some in California say almond cultivation has contributed to drought.
And so it is no surprise to see the almond lined up in the rogue’s gallery of the thirstiest foods. In a study in the journal Nature Food, University of Michigan (U-M) and Tulane University researchers assessed how the food we eat affects water scarcity.
Meat consumption was found to be the biggest culprit in the US, with the hooves and feet of livestock accounting for 31% of the water scarcity footprint. Within the meat category, beef is the thirstiest, with almost six times more water consumption than chicken.
Almond crops in California have come under heavy criticism due to their heavy water consumption
However, the picture is a little more nuanced. Lead author Martin Heller, of U-M's School for Environment and Sustainability, explains: “Beef is the largest dietary contributor to the water scarcity footprint, as it is for the carbon footprint. But the dominance of animal-based food is diminished somewhat in the water scarcity footprint, in part because the production of feed grains for animals is distributed throughout less water-scarce regions, whereas the production of vegetables, fruits and nuts is concentrated in water-scarce regions of the United States, namely the West Coast states and the arid Southwest.”
Certain types of diets drain the water supply. People who eat large quantities of beef, nuts such as the infamous almond, walnut, and cashew, and a high proportion of water-intense fruits and vegetables including lemon, avocado, asparagus, broccoli, and cauliflower take a heavy toll on the water footprint.
The Brussels sprout is not just for Christmas… it is a less water intense option for your dinner table.
“The water-use impacts of food production should be a key consideration of sustainable diets,” adds study co-author Diego Rose of Tulane University. “There is a lot of variation in the way people eat, so having a picture with this sort of granularity – at the individual level – enables a more nuanced understanding of potential policies and educational campaigns to promote sustainable diets.”
So, what do you do the next time you feel a pang of water guilt? According to the researchers, you could swear off asparagus and that crushed avocado on your toast and replace them with less water intense foods such as fresh peas, Brussels sprouts, cabbage, and kale (but maybe not on your toast). Those beef steaks and hamburgers could make way for other protein sources, such as chicken, pork, and soybeans, and you could graze on peanuts and seeds instead of those honey roasted almonds you love so dearly. Just think of all those gallons of water you’ll save.
For more on this study, visit: https://www.nature.com/articles/s43016-021-00256-2
What do grape stalks, pineapple leaves, corn cobs, rice husks, sheep’s wool, and straw have in common? Apart from being natural materials, they have all been used to insulate homes. Increasingly, people are turning towards natural, sustainable materials as climate change and waste have become bigger problems.
Existing building insulation materials such as synthetic rock wool are excellent at keeping our homes warm in winter, but the conversation has moved beyond thermal performance. Energy use, re-usability, toxicity, and material disposal are all live considerations now, especially with regulations and emissions targets tightening. So, rock wool might perform better than straw bale insulation but straw is biodegradable, reusable, easy to disassemble, and doesn’t require large amounts of energy to process.
Sheep’s wool and hemp insulation have also become attractive to homeowners and housebuilders alike, but an even more encouraging prospect is the use of waste materials to create next generation insulation. In this spirit, researchers at Flinders University in Adelaide, Australia, have taken waste cooking oil, wool offcuts, and sulphur to process a novel housing insulation material.
Recycled paper is one of many waste materials that has found its way into domestic insulation.
To make this composite, they followed several stages. In the first stage of the synthesis, the researchers used inverse vulcanisation to create a polysulphide polymer from canola oil triglyceride and sulphur. They then mixed this powdered polymer with wool and coated the fibres through electrostatic attraction. This mixture was compressed through mild heating to provoke S−S metathesis in the polymer and bind the wool. The wool bolsters the tensile strength of the material, makes it less flammable, and provides excellent insulation. The result is a sustainable building material that fulfils its function without damaging the environment.
For Associate Professor Justin Chalker, the lead author of this study, this work provides an ideal jumping-off point. “The promising mechanical and insulation properties of this composite bodes well for further exploration in energy saving insulation in our built environment,” he said.
It is clear that ventures like the one in Adelaide will continue to sprout all over the world. After all, necessity dictates that we change the way we build our homes and treat materials.
A recent report from Emergen Research predicts that the global insulation materials market will be worth US $82.96 billion (£59.78 billion) by 2027. The same report was also at pains to mention that the increasing demand for reduced energy consumption in buildings will be a significant factor in influencing industry growth.
“Market revenue growth is high and expected to incline rapidly going ahead due to rising demand for insulation materials... to reduce energy consumption in buildings,” it said. One of the main reasons given for this increased green building demand was stricter environmental regulations.
And Emergen isn’t the only organisation feeling the ground moving. Online roofing merchant Roofing Megastore, which sells more than 30,000 roofing materials, has detected a shift towards environmentally friendly materials, with many homeowners sourcing these products themselves.
Rock wool insulation panels have come under greater scrutiny in recent times.
Having analysed two years of Google search data on sustainable building materials, the company found that synthetic roof tiles are generating the most interest from the public. Like the Flinders insulation, these roof tiles make use of waste materials, in this case recycled limestone and plastic. And you don’t need to look far down the list to find sustainable insulation materials, with sheep’s wool insulation in 9th place, wood fibre insulation in 10th, and hemp insulation in 12th.
Over time, the logic of the progression towards natural, less energy-intensive building materials will become harder to ignore. “Traditional materials such as synthetic glass mineral wool offer high levels of performance but require large amounts of energy to produce and must be handled with care while wearing PPE,” the company noted. “Natural materials such as hemp or sheep’s wool, however, require very little energy to create and can be installed easily without equipment.”
So, the next time you look down at your nutshells, spent cooking oil, or tattered woollen sweater, think of their potential. In a few years, these materials could be sandwiched between your walls, keeping you warm all winter.
Insulating composites made from sulphur, canola oil, and wool (2021): https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cssc.202100187?af=R
Rising anxiety about air pollution, physical, and mental health, exacerbated by Covid-19 and concerns about public transport, has seen an increase in the popularity of cycling around Europe, leading many cities to transform their infrastructure correspondingly.
These days, Amsterdam is synonymous with cycling culture. Images of thousands of bikes piled up in tailor-made parking facilities continue to amaze and it is routinely held up as an example of greener, cleaner, healthier cities. Because The Netherlands is so flat, people often believe it has always been this way. But, in the 1970s, Amsterdam was a gridlocked city dominated by cars. The shift to cycling primacy took work and great public pressure.
For some cities, however, the pandemic has provided an unexpected opportunity on the roads. Milan's Deputy Mayor for Urban Planning, Green Areas and Agriculture, Pierfrancesco Maran, has explained that, "We tried to build bike lanes before, but car drivers protested". Now, however, numbers have increased from 1,000 to 7,000 on the main shopping street. "Most people who are cycling used public transport before”, he said. “But now they need an alternative”.
Creating joined up cycling networks is a major challenge for urban planners.
In Paris, the Deputy Mayor David Belliard does not seem concerned that the city’s investment since the start of the pandemic will go to waste. “It's like a revolution," he said. “Some sections of this road are now completely car-free. The more you give space for bicycles, the more they will use it.” They are committed to creating a cycle culture, providing free cycling lessons and subsidising the cost of bike repairs. The city intends to create more than 650km of cycle lanes in the near future.
The success in these two cities has been supported by local government but it has also been fuelled by an understandable (and encouraged) avoidance of public transport and fewer cars on the road generally. Going forward, however, it seems likely that those last two factors won’t be present. So how do you create a cycling culture in your city in the long run?
The answer is both simple and difficult: cyclists (and pedestrians) need to have priority over cars. In Brussels, where 40km of cycle track have been put down in the last year, specific zones have been implemented where this is the case, and speed limits have been reintroduced across the city.
In Copenhagen, in the late 1970s, the Danish Cyclists’ Federation arranged demonstrations demanding more cycle tracks and a return to the first half of the century, when cyclists had dominated the roads. Eventually, public pressure paid off — although there is still high demand for more cycle lanes. A range of measures, including changes made to intersections, make cyclists feel safer and local studies show that, as cyclist numbers increase, safety also increases. In many parts of the city, it is noticeable how little of the wide roads are actually available to cars: bikes, joggers, and pedestrians are all accommodated.
Segregated cycleways, like this one in Cascais, Portugal, make people more likely to cycle.
But, if you were starting from scratch, you might not simply add cycle lanes to existing roads and encourage behavioural changes on the road. Segregated, protected bike lanes like those introduced in Paris are the next level up and the results suggest they work — separated from the roads, more people are inclined to try cycling.
Dutch experts suggest, where possible, going even further. Frans Jan van Rossem, a civil servant specialising in cycling policy in Utrecht, believes the best option is to create solitary paths, separated from the road by grass, trees, or elevated concrete. Consistency is also important. Cities need networks of cycle tracks, not just a few highways. Again, prioritising cyclists is key to the Dutch approach. Many cities have roads where cars are treated as guests, restricted by a speed limit of 30km/hour and not permitted to pass. Signage is also key.
In London, Mayor Sadiq Khan’s target is for 80% of journeys to be made by walking, cycling, and/or public transport by 2041. Since 2018, the city has been using artificial intelligence to better understand road use in the city and plan new cycle routes in the capital. However, the experience of other European capitals suggests that, "if you build it, they will come" might be a better approach than working off current usage.
A completely clean, renewable energy system that can be produced locally and that can easily power heat, energy storage and transportation, and travel — that's the future that promoters of a hydrogen economy envisage.
If it sounds a bit like rocket science, that's because it is. Hydrogen is what's used to fuel rockets — that’s how powerful it is. In fact, it’s three times more powerful as a fuel than gas or other fossil-based sources. And, after use, it’s frequently converted to drinking water for astronauts.
US President Joe Biden has highlighted the potential of hydrogen in his ambitious plans for economic and climate recovery and a number of recent reports have been encouraging about hydrogen’s breakthrough moment, including McKinsey and Company (Road Map to a US Hydrogen Economy, 2020) and the International Energy Agency.
Hydrogen fuel cells provide a tantalising glimpse into our low-carbon future
The McKinsey report claims that, by 2030, the hydrogen sector could generate 700,000 jobs and $140bn in revenue, growing to 3.4 million jobs and $750bn by 2050. It also believes it could account for a 16% reduction in CO2 emissions, a 36% reduction in NOx emissions, and supply 14% of US energy demand.
So how does it work?
Simply put, hydrogen fuel cells combine hydrogen and oxygen atoms to produce electricity. The hydrogen reacts with oxygen across an electrochemical cell and produces electricity, water, and heat.
This is what gets supporters so excited. In theory, hydrogen is a limitless, incredibly powerful fuel source with no direct emissions of pollutants or greenhouse gases.
So what's the problem?
Right now, there are actually a few problems. The process relies on electrolysis and steam reforming, which are extremely expensive. The IEA estimates that to produce all of today’s dedicated hydrogen output from electricity would require 3,600TWh, more than the total annual electricity generation of the European Union.
Moreover, almost 95% of hydrogen currently is produced using fossil fuels such as methane, natural gas, or coal (this is called "grey hydrogen"). Its production is responsible for annual CO2 emissions equivalent to those of Indonesia and the United Kingdom combined. In addition, its low density makes it difficult to store and transport — it must be under high pressure at all times. It’s also well-known for being highly flammable — its use as a fuel has come a long way since the Hindenburg Disaster but the association still makes many people nervous.
A Hydrogen refuelling station Hafencity in Hamburg, Germany. Infrastructure issues must be addressed if we are to see more hydrogen-fuelled vehicles on our roads. | Image credit: fritschk / Shutterstock.com
So there are quite a few problems. What’s the good news?
In the last few years, we've seen how rapidly investment, innovation, and infrastructure policy can completely transform individual renewable energy industries. For example, the IEA analysis believes the declining costs of renewables and the scaling up of hydrogen production could reduce the cost of producing hydrogen from renewable electricity 30% by 2030.
Some of the issues around expense could be resolved by mass manufacture of fuel cells, refuelling equipment, and electrolysers (which produce hydrogen from electricity and water), made more likely by the increased interest and urgency. Those same driving forces could improve infrastructural issues such as refuelling stations for private and commercial vehicles, although this is likely to require coordination between various stakeholders, including national and local governments, industry, and investors.
The significant gains in renewable energy mean that “green” hydrogen, where renewable electricity powers the electrolysis process, is within sight.
The IEA report makes clear that international co-operation is “vital” to progress quickly and successfully with hydrogen energy. R&D requires support, as do first movers in mitigating risks. Standards need to be harmonised, good practice shared, and existing international infrastructure built on (especially existing gas infrastructure).
If hydrogen can be as efficient and powerful a contributor to a green global energy mix as its proponents believe, then it's better to invest sooner rather than later. If that investment can help power a post-Covid economic recovery, even better.
Broad beans are an undemanding and valuable crop for all gardens. Probably originating in the Eastern Mediterranean and grown domestically since about 6,000BC, this plant was brought to Great Britain by the Romans.
Header image: a rich harvest of succulent broad beans for the table
Capable of tolerating most soil types and temperatures they provide successional fresh pickings from June to September. Early crops are grown from over-wintered sowings of cv Aquadulce. They are traditionally sown on All Souls Day on 2 November but milder autumns now cause too rapid germination and extension growth. Sowing is best now delayed until well into December. Juicy young broad bean seedlings offer pigeons a tasty winter snack, consequently protection with cloches or netting is vital insurance.
From late February onwards dwarf cultivars such as The Sutton or the more vigorous longer podded Meteor Vroma are used. Early cropping is promoted by growing the first batches of seedlings under protection in a glasshouse. Germinate the seed in propagating compost and grow the resultant seedlings until they have formed three to four prominent leaflets. Plant out into fertile, well-cultivated soil and protect with string or netting frameworks supported with bamboo canes to discourage bird damage.
Young broad bean plants supported by string and bamboo canes
More supporting layers will be required as the plants grow and mature. Later sowings are made directly into the vegetable garden. As the plants begin flowering remove the apical buds and about two to three leaves. This deters invasions by the black bean aphid (Aphis fabae). Winged aphids detect the lighter green of upper foliage of broad beans and navigate towards them!
Allow the pods ample time for swelling and the development of bean seeds of up to 2cm diameter before picking. Beware, however, of over-mature beans since these are flavourless and lack succulence. Broad beans have multiple benefits in the garden and for our diets. They are legumes and hence the roots enter mutually beneficial relationships with nitrogen fixing bacteria. These bacteria are naturally present in most soils. They capture atmospheric nitrogen, converting it into nitrates which the plant utilises for growth. In return, the bacteria gain sources of carbohydrates from photosynthesis.
Broad bean root carrying nodules formed around colonies of nitrogen fixing bacteria
Broad beans are pollinated by bees and other beneficial insects. They are good sources of pollen and nectar, encouraging biodiversity in the garden. Nutritionally, beans are high in protein, fibre, folate, Vitamin B and minerals such as manganese, phosphorus, magnesium and iron, therefore cultivating healthy living. Finally, they form extensive roots, improving soil structure, drainage and reserves of organic nitrogen. Truly gardeners’ friends!
Professor Geoff Dixon, author of Garden practices and their science (ISBN 978-1-138-20906-0) published by Routledge 2019.
The Organisation for Economic Cooperation and Development (OECD) defines the Blue Economy as ‘all economic sectors that have a direct or indirect link to the oceans, such as marine energy, coastal tourism and marine biotechnology.’ Other organisations have their own definitions, but they all stress the economic and environmental importance of seas and oceans.
Header image: Our oceans are of economic and environmental importance
To this end there are a growing number of initiatives focused on not only protecting the world’s seas but promoting economic growth. At the start of 2021 the Asian Development Bank (ADB) and the European Investment Bank (EIB) joined forces to support clean and sustainable ocean initiatives in the Asia-Pacific region, and ultimately contribute to achieving Sustainable Development Goals and the climate goals of the Paris Agreement.
Both institutions will finance activities aimed at promoting cleaner oceans ‘through the reduction of land-based plastics and other pollutants discharged into the ocean,’ as well as projects which improve the sustainability of all socioeconomic activities that take place in oceans, or that use ocean-based resources.
ADB Vice-President for Knowledge Management and Sustainable Development, Bambang Susantono, said ‘Healthy oceans are critical to life across Asia and the Pacific, providing food security and climate resilience for hundreds of millions of people. This Memorandum of Understanding between the ADB and EIB will launch a framework for cooperation on clean and sustainable oceans, helping us expand our pipeline of ocean projects in the region and widen their impacts’.
The blue economy is linked to green recovery
In the European Union the blue economy is strongly linked to the bloc’s green recovery initiatives. The EU Blue Economy Report, released during June 2020, indicated that the ‘EU blue economy is in good health.’ With five million people working in the blue economy sector during 2018, an increase of 11.6% on the previous year, ‘the blue economy as a whole presents a huge potential in terms of its contribution to a green recovery,’ the EU noted. As the report was launched, Mariya Gabriel, Commissioner for Innovation, Research, Culture, Education and Youth, responsible for the Joint Research Committee said; ‘We will make sure that research, innovation and education contribute to the transition towards a European Blue Economy.’
The impact of plastics in oceans is well known and many global initiatives are actively tackling the problem. At the end of 2020 the World Economic Forum and Vietnam announced a partnership to tackle plastic pollution and marine plastic debris. The initiative aims to help Vietnam ‘dramatically reduce its flow of plastic waste into the ocean and eliminate single-use plastics from coastal tourist destinations and protected areas.’ Meanwhile young people from across Africa were congratulated for taking leadership roles in their communities as part of the Tide Turners Plastic Challenge. Participants in the challenge have raised awareness of the impact of plastic pollution in general.
But it isn’t just the health of our oceans that governments and scientists are looking at. There is growing interest in the minerals and ore that could potentially be extracted via sea-bed mining. The European Commission says that the quantity of minerals occupying the ocean floor is potentially large, and while the sector is small, the activity has been identified as having the potential to generate sustainable growth and jobs for future generations. But adding a note of caution, the Commission says, ‘Our lack of knowledge of the deep-sea environment necessitates a careful approach.’ Work aimed at shedding light on the benefits, drawbacks and knowledge gaps associated with this type of mining is being undertaken.
With the push for cleaner energy and the use of batteries, demand for cobalt will rise, and the sea-bed looks to have a ready supply of the element. But, the World Economic Forum points out that the ethical dimensions of deep-sea cobalt have the potential to become contentious and pose legal and reputational risks for mining companies and those using cobalt sourced from the sea-bed.
Energy will continue to be harnessed from the sea.
But apart from its minerals, the ocean’s ability to supply energy will continue to be harnessed through avenues such as tidal and wind energy. During the final quarter of 2020, the UK Hydrographic Office launched an Admiralty Marine Innovation Programme. Led by the UK Hydrographic Office, the programme gives innovators and start-ups a chance to develop new solutions that solve some of the world’s most pressing challenges as related to our oceans.
The UK’s Blue Economy is estimated to be worth £3.2 trillion by the year 2030. Marine geospatial data will be important in supporting this growth by enabling the identification of new areas for tidal and wind energy generation, supporting safe navigation for larger autonomous ships, which will play a vital role in mitigating climate change, and more.
The world’s biggest ever survey of public opinion on climate change was published on 27th January, covering 50 countries with over half of the world’s population, by the United Nations Development Programme (UNDP) and the University of Oxford. Of the respondents, 64% believe climate change is a global emergency, despite the ongoing Covid-19 pandemic, and sought broader action to combat it. Earlier in the month, US President Joe Biden reaffirmed the country's commitment to the Paris Agreement on Climate Change.
It is possible that the momentum, combined with the difficulties many countries currently face, may make many look again to geoengineering as an approach. Is it likely that large scale engineering techniques could mitigate the damage of carbon emissions? And is it safe to do so or could we be exacerbating the problem?
The term has long been controversial, as have many of the suggested techniques. But it would seem that some approaches are gaining more mainstream interest, particularly Carbon Dioxide Removal (CDR) and Solar Radiation Modification (SRM), which the 2018 Intergovernmental Panel on Climate Change (IPCC) report for the UN suggested were worth further investigation (significantly, it did not use the term "geoengineering" and distinguished these two methods from others).
One of the most covered CDR techniques is Carbon Capture and Storage (CCS) or Carbon Capture, Utilisation, and Storage (CCUS), the process of capturing waste carbon dioxide, usually from carbon intensive industries, and storing (or first re-using) it so it will not enter the atmosphere. Since 2017, after a period of declining investment, more than 30 new integrated CCUS facilities have been announced. However, there is concern among many that it will encourage further carbon emissions when the goal should be to reduce and use CCS to buy time to do so.
CDR techniques that utilise existing natural processes of natural repair, such as reforestation, agricultural practices that absorb carbon in soils, and ocean fertilisation are areas that many feel could and should be pursued on a large scale and would come with ecological and biodiversity benefits, as well as fostering a different, more beneficial relationship with local environments.
A controversial iron compound deposition approach has been trialled to boost salmon numbers and biodiversity in the Pacific Ocean.
The ocean is a mostly untapped area with huge potential and iron fertilisation is one very promising area. The controversial Haida Salmon Corporation trial in 2012 is perhaps the most well-known example and brings together a lot of the pros and cons frequently discussed in geoengineering — in many ways, we can see it as a microcosm of the bigger issue.
The trial deposited 120 tonnes of iron compound in the migration routes of pink and sockeye salmon in the Pacific Ocean 300k west of Haida Gwaii over a period of 30 days, which resulted in a 35,000km2, several month long phytoplankton bloom that was confirmed by NASA satellite imagery. That phytoplankton bloom fed the local salmon population, revitalising it — the following year, the number of salmon caught in the northeast Pacific went from 50 million to 226 million. The local economy benefited, as did the biodiversity of the area, and the increased iron in the sea captured carbon (as did the biomass of fish, for their lifetimes).
Small but mighty, phytoplankton are the laborers of the ocean. They serve as the base of the food web.
But Environment Canada believes the corporation violated national environmental laws by depositing iron without a permit. Much of the fear around geoengineering is how much might be possible by rogue states or even rogue individuals, taking large scale action with global consequences without global consent.
The conversation around SRM has many similarities — who decides that the pros are worth the cons, when the people most likely to suffer the negative effects, with or without action, are already the most vulnerable? This is a concern of some of the leading experts in the field. Professor David Keith, an expert in the field, has publicly spoken about his concern around climate change and inequality, adding after the latest study that, "the poorest people tend to suffer most from climate change because they’re the most vulnerable. Reducing extreme weather benefits the most vulnerable the most. The only reason I’m interested in this is because of that."
But he doesn't believe anywhere near sufficient research has been done into the viability of the approach or the possible consequences and cautions that there is a need for "an adequate governance system in place".
There is no doubt that the research in this field is exciting but there are serious ethical and governance problems to be dealt with before it can be considered a serious component of an emissions reduction strategy.
Gardens and parks provide visual evidence of climate change. Regular observation shows us that our flowering bulbous plants are emerging, growing and flowering. Great Britain is particularly rich in long term recordings of dates of budbreak, growth and flowering of trees, shrubs and perennial herbaceous plants. Until recently, this was dismissed as ‘stamp collecting by Victorian ladies and clerics’.
The science of phenology now provides vital evidence that quantifies the scale and rapidity of climate change. Serious scientific evidence of the impact of climate change comes, for example, from an analysis of 29,500 phenological datasets. This research shows that plants and animals are responding consistently to temperature change with earlier blooming, leaf unfurling, flowering and migration. This scale of change has not been seen on Earth for the past three quarters of a million years. And this time it is happening with increased rapidity and is caused by the activities of a single species – US – humans!
Iris unguicularis (stylosa).
Changing seasonal cycles seriously affects our gardens. Fruit trees bloom earlier than previously and are potentially out of synchrony with pollinators. That results in irregular, poor fruit set and low yields. Climate change is causing increased variability in weather events. This is particularly damaging when short, very sharp periods of freezing weather coincide with precious bud bursts and shoot growth. Many early flowering trees and shrubs are incapable of replacing damaged buds, as a result a whole season’s worth of growth is lost. Damaged buds and shoots are more easily invaded by fungi which cause diseases such as dieback and rotting. Eventually valuable feature plants fail, damaging the garden’s benefits for enjoyment and relaxation.
Plant diseases caused by fungi and bacteria benefit from our increasingly milder, damper winters. Previously, cooling temperatures in the autumn and winter frosts prevented these microbes from over-wintering. Now they are surviving and thriving in the warmer conditions. This is especially the case with soil borne microbes such as those which cause clubroot of brassicas and white rot, which affects a wide range of garden crops.
Hazel (Coryllus spp.) typical wind-pollinated yellow male catkins, which produce pollen.
Can gardeners help mitigate climate change? Of course! Grow flowering plants which are bee friendly; minimise using chemical controls; ban bonfires – which are excellent sources of CO2; establish wildlife-friendly areas filled with native plants and pieces of rotting wood, and it is amazing how quickly beneficial insects, slow worms and voles will populate your garden.
Professor Geoff Dixon is the author of Garden Practices and their Science, published by Routledge 2019.
Understanding organisms’ capabilities of sensing environmental changes such as increasing or declining temperature is becomes ever more important. Deciduous woody trees and shrubs growing in cool temperate and sub-arctic regions enter quiescent or dormant states as protection against freezing temperatures.
These plants pass through a two-stage process. Firstly, they gradually acclimatise (or 'acclimate', in the USA) where lowering temperatures encourage capacities for withstanding cold. This is a reversible process and if there is a spell of milder weather the acclimatisation state is lost. This can happen, for instance, with a fine spell of 'Indian summer' in October or even early November.
Winter weather and dormant trees. All images by Geoff Dixon
Where acclimation is broken, plants become susceptible to cold-induced damage again. If acclimation continues, however, plants eventually become fully dormant. This is not a reversible state and only ends after substantial periods of warming weather and increasing day-length. Some plants will require an accumulation of 'cold-units' – ie, temperatures below a specific level before dormancy is broken.
Detailed research information is accumulating to describe how acclimatisation develops. Changes take place that strengthen cell membranes, possibly by increasing the bonding in lipid molecules, and causing alterations in respiration rates, enzyme activities and hormone levels.
Non-acclimatised azalea (front), acclimatised azalea (back).
Leaves in a non-acclimated state will leak cellular fluids when they are chilled, whereas acclimated leaves are undamaged. These processes result from an interaction between genotype and the environment. Cascades of genes come into play during acclimation and dormancy.
The genus Rhododendron offers a model for studies of these states. Some species originate from alpine environments, such as R. hirsutum coming from the European Alps and one of the first English garden 'rhodos'. By contrast, plants of R. vireya come from tropical areas such as the East Indies.
Comparing the leakage of cellular fluids in acclimatised and non-acclimatised rhododendron leaves subjected to -7°C
Practical outcomes from studies of acclimation and dormancy are twofold. Firstly, are there substances that could be sprayed onto cold susceptible crops, eg potatoes or cauliflowers, that prevent damage? This is so-called 'anti-freeze chemistry'. Some studies suggest that spraying seaweed extracts will dimmish damage. The downside of this approach is that rain washes off the application. Secondly, identifying genes which increase cold hardiness offers possibilities for their transfer into susceptible crops. Gene-editing techniques may offer means of tweaking existing cold-hardiness genes in susceptible crops.
Professor Geoff Dixon is the author of Garden Practices and their Science, published by Routledge 2019.
Growing in just about the most challenging of locations in the SCIence Garden are a small group of Helleborus niger. They are planted in a very dry and shady location underneath a large tree sized Escallonia and although they struggled to establish when they were first planted (in May 2017) they are now flowering and growing well.
This plant was first featured as a Horticulture Group Medicinal Plant of the Month in December 2011 and as it is now in the SCIence garden I thought a reprise was in order.
Helleborus is a genus of 15 species of evergreen perennials in the buttercup family, Ranunculaceae. In common with most members of the family, the flowers are radially symmetric, bisexual and have numerous stamen.
Helleborus is the Latin name for the lent hellebore, and niger means black – referring in this species to the roots.
This species is native to the Alps and Appenines. Helleborus niger has pure white flowers, with the showy white parts being sepals (the calyx) and the petals (corolla) reduced to nectaries. As with other hellebores, the sepals persist long after the nectaries (petals) have dropped.
All members of the Ranunculaceae contain ranunculin, an unstable glucoside, which when the plant is wounded is enzymatically broken down into glucose and protoanemonin. This unsaturated lactone is toxic to both humans and animals, causing skin irritation and nausea, vomiting, dizziness and worse if ingested.
Protoanemonin dimerises to form anemonin when it comes into contact with air and this is then hydrolysed, with a concomitant ring-opening to give a non-toxic dicarboxylic acid.
Many hellebores have been found to contain hellebrin, a cardiac glycoside. The early chemical literature suggests that this species also contains the substance but later studies did not find it suggesting that either mis-identified or adulterated material was used in the early studies.
It is reported to contain many other specialized metabolites including steroidal saponins.
This plant has long been used in traditional medicine – in European, Ayurvedic and Unani systems and recent research has been aimed at elucidating what constituents are responsible for the medicinal benefit.
Extract of black hellebore is used sometimes in Germany as an adjuvant treatment for some types of tumour.
A recent paper* reports the results of a safety and efficacy investigation. The Helleborus niger extract tested was shown to exhibit neither genotoxic nor haemolytic effects but it was shown to have anti-angiogenetic effects on human umbilical vein endothelial cells (HUVEC), anti-proliferative effects and migration-inhibiting properties on tumour cells thus supporting its use in cancer treatment.
* Felenda, J.E., Turek, C., Mörbt, N. et al. Preclinical evaluation of safety and potential of black hellebore extracts for cancer treatment. BMC Complement Altern Med 19, 105 (2019) doi:10.1186/s12906-019-2517-5
Springtime colour is one of gardening’s greatest joys. Colourful bursts dispel the long darkness of winter with its depressing wetness and cold. Social research is clearly showing the physical and mental benefits obtained from the emergence in spring of bright garden colours linked with lengthening daylight. As with most gardening pleasures, this requires advanced financial outlay and an understanding of the rhythms of plant growth.
Planting bulbs such as daffodils, tulips and hyacinths in autumn is the necessary investment. In return, plant breeders now provide a huge array of colours, shapes, sizes and seasonal sequencing with bulbous plants.
Geoff Dixon: February Gold daffodils
Bulbs are large pieces of vegetative tissue which come pre-loaded with immature leaves and flowers, safely wrapped inside a dry coating of protective scales. Essentially, bulbs are large flower buds which are stimulated into growth by planting in warm, moist soil or compost. These conditions trigger the emergence of roots from the base of each bulb. Because bulbs are nascent plants, they require careful handling and are safest once planted.
Many bulbous species originate from higher altitude mountainous pastures and are naturally evolved for dealing with fluctuating periods of heat, cold and drought. Once safely planted at depths which should equal twice the length of each bulb, they will survive the freezing, thawing and fluctuating soil water- content delivered by winter weather.
Geoff Dixon: Bulb structure showing the flower bud embedded in the bulb
Warming soils of spring encourage growth and emergence of the leaves and flower buds contained within each bulb. Speed of emergence is governed by interaction between the genetic complement of bulbs and an interaction with their environment. Identifying and understanding the impact of this interaction formed the basis for Charles Darwin and Alfred Wallaces’ theory of natural selection. For springtime gardeners it is expressed in the multiplicity of bulbs on offer. Choosing a range of daffodil varieties for example, provides colourful gardens from February through to late May.
Geoff Dixon: Technique for planting bulbs using hand trowel and some sand for drainage under the bulb
Conserving the joys of spring pleasure over years can be achieved by naturalising bulbs. This means planting them in grass swards. This works effectively for daffodils, provided the foliage is allowed 8 to 10 weeks of uninterrupted growth and senescence after flowering. During this period, photosynthesis produces the chemical energy needed for replacement growth, which provides bulb multiplication and flower bud development for the following year. Tulips are much less easily naturalised in British gardens. This is because the leaves mature and senesce much more quickly after flowering, hence, less energy is produced, therefore, regrowth is less, and replacement flower buds are not formed.
For most gardeners the policy should be one of enjoying each springtime’s show and replacing bulbs with new ones every autumn for a relatively modest outlay.
Aldrin, Armstrong and Collins, Apollo 11’s brave astronauts were the first humans with the privilege of viewing Earth from another celestial body. These men uniquely wondered “what makes Earth special?” Certainly, within our Solar System, planet Earth is very special. Its environment has permitted the evolution of a panoply of life.
Green plants containing the pigment, chlorophyll either in the oceans as algae or on land as a multitude of trees, shrubs and herbs harvest energy from sunshine. Using a series of chemical reactions, known as photosynthesis, light energy is harvested and attached onto compounds containing phosphorus.
Captured energy then drives a series of reactions in which atmospheric carbon dioxide and water are combined forming simple sugars while releasing oxygen. These sugars are used further by plants in the manufacture of larger carbohydrates, amino acids and proteins, oils and fats.
The release of oxygen during photosynthesis forms the basis of life’s second vital process, respiration. Almost all plants and animals utilise oxygen in this energy releasing process during which sugars are broken down.
Released energy then drives all subsequent growth, development and reproduction. These body-building processes in plants are reliant on the transfer of the products of photosynthesis from a point of manufacture, the source, to the place of use, a sink.
Leaves and shoots are the principle sources of energy harvesting while flowers and fruits are major sinks with high levels of respiration.
Figure 1: Photosynthesis vs respiration, drawn by James Hadley
Transfer between sources and sinks occurs in a central system of pipes, the vascular system, using water as the carrier. Water is obtained by land plants from the soils in which they grow. Without water there would be no transfer and subsequent growth. Earth’s environment is built around a ‘water-cycle’ supplying the land and oceans with rain or snow and recycles water back into the atmosphere in a sustainable manner.
Early in Earth’s evolution, very primitive marine organisms initiated photosynthetic processes, capturing sunlight’s energy. As a result, in our atmosphere oxygen became a major component. That encouraged the development of the vast array of land plants which utilise rain water as the key element in their transport systems.
Subsequently, plants formed the diets of all animals either by direct consumption as herbivores or at second-hand as carnivores. As a result, evolution produced balanced ecosystems and humanity has inherited what those astronauts saw, “the Green Planet”.
Earth will only retain this status if humanity individually and collectively defeats our biggest challenge – climate change. Burning rain forests in South America, Africa and Arctic tundra will disbalance these ecosystems and quicken climate change.
This is only the latest in a litany of exotics to ravage American forests. Sixty-two high-impact insect species and a dozen pathogens have arrived since the 1600′s. Only two were detected before 1860.
The emerald ash borer. Image; Wikimedia Commons
Increased global trade and travel, along with climate change and warmer winters, are all fueling the problem. And the devastation has pushed scientists and foresters to look towards biotechnology for a remedy.
‘Almost every day there appears to be a new forest pest and some of these are quite devastating,’ says tree geneticist Jeanne Romero-Severson at the University of Notre Dame, Indiana, US.
‘Biotech approaches such as transgenic technology and CRISPR gene editing could be valuable tools in saving specific species.’
These biotech solutions look sexier to funders, and policymakers, and that is where the resources go. But in many ways, it is a dead end if you don’t have a foundational breeding programme to feed into,’ warns DiFazio, a plant geneticist at West Virginia University, US.
A technology like CRISPR for gene editing is fast and powerful, but mostly it is used in lab organisms where much is known about their genetics. Without deep knowledge of a tree’s genome, CRISPR will be far less useful.
CRISPR is a gene editing tool that first came to prominence in the 1990′s and is considered one of the most disruptive technologies in modern medicine.
Powell, a plant scientist at the State University of New York (SUNY), US acknowledges that ‘the biggest thing is to the get the public onboard; a lot of people are afraid of genetic engineering.
Surveys suggest that knowledge about genetic engineering technology, as well as about threats to forest health, is fairly low amongst the general public. Given these deficits, ‘public opinion might be vulnerable to changes,’ notes Delborne.
Cooking, cleaning and other routine household tasks generate significant quantities of volatile and particulate chemicals inside the average home, leading to indoor air quality levels on a par with a polluted major city, said a researcher from Colorado University Boulder, US.
Not only that but these chemicals, from products such as shampoo, perfume and cleaning solutions also find their way into the external environment, making up an even greater source of global atmospheric pollution than vehicles.
‘Homes have never been considered an important source of outdoor pollution and the moment is right to start exploring that,’ said Marina Vance, assistant professor of mechanical engineering at CU Boulder. ‘We wanted to know how do basic activities such as cooking and cleaning change the chemistry of a house?’
First Conclusions from the HOMEChem Experiment. Video: Home Performance
In 2018, Vance co-led the collaborative HOMEChem field campaign, which used advanced sensors and cameras to monitor the indoor air quality of a 112m2 manufactured home on the University of Texas Austin campus.
Over one month, Vance and her collaborators from a number of other US universities conducted a variety of activities, including cooking toast to a full thanksgiving dinner in the middle of the summer for 12 guests, as well as cleaning and similar tasks.
After eight months of operation in Antarctica, the EDEN ISS greenhouse has produced a ‘record harvest’ of fresh lettuce, cucumbers, tomatoes, and other herbs and vegetables to support the 10-member overwintering crew stationed at the German Neumayer Station III, the team reported in September 2018. Despite outdoor temperatures of -20°C and low levels of sunlight, the greenhouse yielded 75kg of lettuce, 51kg of cucumbers, 29kg of tomatoes, 12kg of kohlrabi, 5kg of radishes and 9kg of herbs – on a cultivation area of ca13m2.
The goal of the EDEN ISS is to demonstrate technologies that could be used by future astronauts to grow their own food on long distance missions to Mars and other more distant planets, explained NASA controlled environment technician Connor Kiselchuk, speaking at the Bayer Future of Farming Dialogue event in Monheim in September 2018. ‘Food determines how far from the Earth we can go and how long we can stay,’ he said.
How does the EDEN ISS greenhouse in Antarctica work? Video: German Aerospace Center, DLR
Even if astronauts took a year and a half’s supply of food with them on a mission to Mars, for example, he pointed out that the food would be ‘very deficient in B vitamins’ by the time they came to eat it.
Researchers have detected high levels of sunscreen chemicals in the waters of Shenzhen, China. These include beaches, a harbour, a reservoir, and even tap water. In tests on zebrafish, the team showed that several of these UV ﬁlters are being transmitted through the food chain, and can have adverse effects on developing offspring.
Organic UV ﬁlters found in sunscreens, skin lotions and make-up, as well as textiles, plastics, and paints, are endocrine disruptors.
The river and rice fields to the West of Shenzhen, China. Image: Wikimedia Commons
Risk assessments for single compounds have concluded that current levels of organic UV ﬁlters pose low risk, but they don’t account for interactions of mixtures and how these interactions develop over time.
Kelvin Sze-Yin Leung’s team at Hong Kong Baptist University analysed nine common organic UV ﬁlters in surface waters of Shenzhen, a city with more than 20 popular beaches. They found seven of the nine chemicals, including benzophenone derivatives BP-3, BP-8, and BP-1, as well as ethylhexyl methoxycinnamate (EHMC), at public beaches, a harbour, a reservoir, and in tap water.
Which sunscreen should you use? Video: Ted-Ed
Total concentrations of UV ﬁlters were relatively high at three popular public beaches – ranging from 192 to 645ngL-1 – in the summer as expected. Shenzhen Reservoir showed UV ﬁlter pollution in both seasons, while tap water was contaminated by BP-3.
If inefficient water treatment processes are to blame, then research is needed into other ways to remove these ﬁlters to protect human health, says Sze-Yin Leung.
Transparent solar cells that can convert invisible light wavelengths into renewable energy could supply 40% of the US’ energy demand, a Michigan State University (MSU) engineering team have reported.
In contrast to the robust, opaque solar panels that take up a large amount of space – whether on rooftops or on designated solar farms – the transparent solar cells can be placed on existing surfaces, such as windows, buildings, phones, and any other object with a clear surface.
Traditional solar panels require large amounts of space.
‘Highly transparent solar cells represent the wave of the future for new solar cell applications,’ says Richard Lunt, Associate Professor of Chemical Engineering and Materials Science at MSU.
‘We analysed their potential and show that by harvesting only invisible light, these devices can provide a similar electricity generation potential as rooftop solar while providing additional functionality to enhance the efficiency of buildings, automobiles, and mobile electronics.’
Solar, or photovoltaic, cells convert the sun’s energy into electricity. Image: Pixabay
Currently, the cells are running at 5% efficiency, says the team, compared to traditional solar panels that have recorded efficiencies between 15-18%. Lunt believes that with further research, the capability of the transparent cells could increase three-fold.
‘That is what we are working towards,’ says Lunt. ‘Traditional solar applications have been actively researched for over five decades, yet we have only been working on these highly transparent solar cells for about five years.’
The cells can be added to any existing transparent surface, including mobile phones. Image: Max Pixel
While solar panels may be more efficient at converting energy than the group’s transparent cells, Lunt says that the latter can be easily applied to more surfaces and therefore a larger surface area, increasing the overall amount of energy produced by the cells.
‘Ultimately,’ he says, ‘this technology offers a promising route to inexpensive, widespread solar adoption on small and large surfaces that were previously inaccessible.’
Transparent solar cells. Video: Michigan State University
Together, and with further work on its efficiency, the authors of the paper believe that their see-through cells and traditional solar panels could fulfil the US’ energy needs.
‘The complimentary deployment of both technologies could get us close to 100% of our demand if we also improve energy storage,’ Lunt says.
Renewable energy has long been known as a greener alternative to fossil fuels, but that doesn’t mean that the former has no negative environmental impacts. Hydropower, for instance, has been known to reduce biodiversity in the land used for its systems.
Now, a team of Norwegian-based researchers have developed a methodology that quantifies the environmental effects of hydropower electricity production.
Ulla-Førre – Norway’s largest hydropower station.
Martin Dorber, PhD candidate in Industrial Ecology at the Norwegian University of Science and Technology (NTNU), is part of the team that developed the analytic tool. ‘Some hydropower reservoirs may look natural at first. However, they are human-influenced and if land has been flooded for their creation, this may impact terrestrial ecosystems,’ he said,
The Life Cycle Assessment, or LCA, can be used by industry and policymakers to identify the trade-offs associated with current and future hydropower projects. Norway is one of the top hydropower producers in the world, with 95% of its domestic electricity production coming from hydropower.
Generations inside the Hoover Dam station. Image: Richard Martin/Flickr
Many hydropower facilities include a dam – many purpose-built for hydropower generation – which stores fresh water from lakes or rivers in a reservoir.
Reducing biodiversity in the areas where hydropower development is being considered is one of the main disadvantages of the renewable source. Reduced freshwater habitats and water quality, and land flooding are among the damaging effects – all of which are difficult to assess, says the team.
‘Land use and land use change is a key issue, as it is one of the biggest drivers of biodiversity loss, because it leads to loss and degradation of habitat for many species,’ said Dorber.
Hydropower development can be damaging to freshwater habitats. Image: Pexels
Using reservoir surface area data from the Norwegian Water Resources and Water Resources Directorate and satellite images from the NASA-USGS Global Land Survey, the team were able to create a life cycle inventory that showed the amount of land needed to produce a kilowatt-hour of electricity.
‘By dividing the inundated land area with the annual electricity production of each hydropower reservoir, we calculated site-specific net land occupation values for the life cycle inventory,’ said Dorber.
‘While it’s beyond the scope of this work, our approach is a crucial step towards quantifying impacts of hydropower electricity production on biodiversity for life cycle analysis.’
While this study is exclusive to hydropower reservoirs in Norway, the team believe this analysis could be adopted by other nations looking to extend their hydropower development and assess the potential consequences.
Pumped-storage hydropower. Video: Statkraft
‘We have shown that remote sensing data can be used to quantify the land use change caused by hydropower reservoirs,’ said Dorber. ‘At the same time our results show that the land use change differs between hydropower reservoirs.’
‘More reservoir-specific land use change assessment is a key component that is needed to quantify the potential environmental impacts.’
Researchers at the University of Waterloo, Canada, have developed an innovative method for capturing renewable natural gas from cow and pig manure for use as a fuel for heating homes, powering industry, and even as a replacement for diesel fuel in trucks.
It is based on a process called methanation. Biogas from manure is mixed with hydrogen, then run through a catalytic converter, producing methane from carbon dioxide in the biogas through a chemical reaction.
A biogas plant. Image: Pixabay
The researchers claim that power could be taken from the grid at times of low demand or generated on-site via wind or solar power to produce the hydrogen.
The renewable natural gas produced would yield a large percentage of the manure’s energy potential and efficiently store electricity, while emitting a fraction of the gases produced when the manure is used as a fertiliser.
‘The potential is huge,’ said David Simakov, Professor of Chemical Engineering at Waterloo. 'There are multiple ways we can benefit from this single approach.’
See a Farm Convert Pig Poop Into Electricity. Video: National Geographic
Using a computer model of a 2,000-head dairy farm in Ontario, which already collects manure and converts it into biogas in anaerobic digesters before burning it in generators, the researchers tested the concept.
They estimated that a $5-million investment in a methanation system would have a five-year payback period, taking government subsidies for renewable natural gas into account.
'This is how we can make the transition from fossil-based energy to renewable energy using existing infrastructure, which is a tremendous advantage,’ Simakov said.
Images of turtles trapped in plastic packaging or a fish nibbling on microfibres pull on the heartstrings, yet many scientists studying plastics in the oceans remain open-minded on the long-term effects.
While plastics shouldn’t be in our oceans, they say there is still insufficient evidence to determine whether microplastics – the very tiniest plastic particles, usually defined as being less than 1mm in diameter – are actually harmful.
It is estimated that over 1,000 turtles die each year from plastic waste. Image: NOAA Marine Debris Program
On top of this, there is debate over how much plastic is actually in the sea and why so much of it remains hidden from view. Much of the research carried out to date is in its early stages – and has so far produced no definitive answers.
‘My concern is that we have to provide the authorities with good data, so they can make good decisions,’ says Torkel Gissel Nielsen, Technical University of Denmark (DTU). ‘We need strong data – not just emotions.’
Searching the sea
Plastic shopping bags can be degraded into microplastics that litter the oceans. Image: Wikimedia Commons
Gissel Nielsen leads a team of researchers who discovered that levels of microplastics in the Baltic Sea have remained constant over the past three decades, despite rising levels of plastics production and use.
The study – by researchers at DTU Aqua, the University of Copenhagen, Denmark, and Geomar, Germany – analysed levels of microplastics in fish and water samples from the Baltic Sea, taken between 1987 and 2015.
‘The result is surprising,’ says Nielsen. ‘There is the same amount of plastic in both the water and the fish when you go back 30 years.’ He claims that previous studies of microplastics levels were ‘snapshots’, while this is the first time levels have been studied over a longer period.
The UK introduced a ban in January this year of the sale and manufacture of products containing microbeads. Image: MPCA Photos
‘The study raises a number of questions, such as where the plastic has gone,’ he says. ‘Does it sink to the bottom, are there organisms that break it down, or is it carried away by currents? Some is in the sediment, some is in the fish, but we need to find out exactly how much plastic is there.’
In the study, more than 800 historical samples of fish were dissected and researchers found microplastics in around 20% of them. This laborious process involved diluting the stomach contents in order to remove ‘organic’ materials, then checking the filtered contents under a microscope to determine the size and concentration of plastics. It illustrates the difficulty of quantifying plastics in any sample, says Gissel Nielsen.
‘You must remove the biology to get a clear view of the plastics,’ he says.
Just as rivers supply the sea with water, they also act as a source of pollution. Researchers at the Helmholtz Centre for Environmental Research (UFZ), Germany, found that 10 large rivers are responsible for transporting 90% of plastic waste into the sea.
The team collected pre-published data on plastics in rivers and collated it with upstream sites of ‘mismanaged’ plastics waste – municipal waste that is uncollected.
‘The more mismanaged plastic waste there was, the more you found in the river,’ says Christian Schmidt, UFZ. ‘There was an empirical relationship between the two.’
The Yangtze river (pictured in Shanghai, China) is the main polluter of plastic in the ocean in the world. Image: Pedro Szekely/Flickr
Eight of these 10 rivers are in Asia, while the other two are in Africa. All of them flow through areas of high population.
‘Countries like India and China have seen huge economic growth – and now use large amounts of plastic food packaging and bottles – but have limited waste collection systems,’ he says. The data include both microplastic and ‘macro’ plastics – but microplastics data dominate ‘because scientists are more interested in that’, says Schmidt.
Plastic Ocean. Video: United Nations
While it is important to measure how much plastic is in the environment, Schmidt believes that the next step of his research will be more important – understanding the journey the plastics make from the river to the sea.
For all the uncertainty and debate over how much plastic is in the sea – and what harm it can do – one thing is clear. Future research is likely to focus more on the plastics that we can’t see, rather than the items we can.
Scientists have developed a new process to manufacture ‘green’ plastic that could significantly reduce costs and provide a cleaner alternative to current materials.
Using fructose and gamma-Valerolactone (GVL) – a plant-derived solvent – researchers from the University of Wisconsin-Madison,US, have found a way to produce furandicarboxylic acid (FDCA) that is both cost-effective and high-yielding, meaning a large amount of the product can be made. FDCA is a precursor to the renewable plastic polyethylene furanoate (PEF).
A crystal of furandicarboxylic acid (FDCA) a plastic precursor created with biomass instead of petroleum. Image: Ali Hussain Motagamwala and James Runde for UW-Madison
‘Until now, FDCA has had a very low solubility in practically any solvent you make it in,’ says co-author Ali Hussain Motagamwala. ‘You have to use a lot of solvent to get a small amount of FDCA, and you end up with high separation costs and undesirable waste products.’
Currently, the plastics market relies heavily on the production of polyethylene terephthalate (PET), which is derived from petroleum, to meet increasing demand for plastic products.
How is FDCA made in industry? Video: Avantium
The team, alongside Motagamwala, have been able to convert fructose to FDCA in a two-step process using a solvent system of one-part GVL and one-part water.
According to Motagamwala, using GVL as a solvent is the key to reducing the high expenses that FDCA production incurs. ‘Sugars and FDCA are both highly soluble in [GVL], you get high yields, and you can easily separate and recycle the solvent,’ he says.
Fructose is a plant-based sugar found in most fruits. Image: Pexels
The team’s study also includes an extensive techno-economic analysis of the ‘green’ process, suggesting that FDCA could be produced for around £1,000 a tonne – reduced further if the reaction time and cost of feedstock could be lowered through further research.
A more cost-effective alternative to PET could have a significant impact on the plastics market, which produces an estimated 1.5m tonnes a year.
Major companies – from Coca-Cola to Procter & Gamble – are committing to 100% use of PEF in their plastic products, providing a huge market need for its precursor FDCA.
‘We think this is the streamlined and inexpensive approach to making FDCA that many people in the plastics industry has been waiting for,’ says James Dumesic, team-leader and Professor of Chemical and Biological Engineering at the university.
Introducing cost-competitive renewable plastics to the market could significantly reduce plastic waste. Image: Pixabay
‘Our hope is that this research opens the door even further to cost-competitive renewable plastics.’
Process development is an essential area of research that underpins advances in a huge range of industries.
In May 2018, the first full-scale mobile marine plastics collection system, developed by The Ocean Cleanup, will leave San Francisco, California, bound for the ‘Great Pacific Garbage Patch,’ also known as the Pacific trash vortex. The plan, ultimately, is to use 60 of these $5m systems to clean up half of the debris in the Pacific Garbage Patch within five years, according to Boyan Slat, CEO of Netherlands foundation The Ocean Cleanup, speaking at the Cefic Chemical Congress held in Vienna, Austria, at the end of October 2017.
Each collection system comprises a 1km U-shaped barrier, which floats on the surface of the ocean and supports a 4m deep screen to channel floating plastic debris to a central collection point, for future recycling. A 100m prototype system has already been tested in the North Sea.
The system will leave from the San Francisco bay area. Image: Giuseppe Milo
The environmental cost of the Pacific’s plastic waste currently stands at roughly $13bn/year, while an estimated 600 wildlife species are threatened with extinction partly as a result of ingesting it. Plastic microbeads and particles only represent 5% of the plastics in the oceans, ‘but the remaining 95% will break down into small particles and chemicals that are already in the tuna we eat,’ Slat said. The larger plastics debris are all found in the top 4m of the oceans, the same depth as the system’s screens.
Plastic debris can end up in the food we eat. Image: Pixabay
Also speaking in Vienna, Emily Woglom, executive VP, Ocean Conservancy, said that 8m t/year of plastics goes into the oceans – ‘one city dump truck every minute’; between 2010 and 2025 the amount in the oceans will double. As much as ‘30% of fish on sale have plastics in them,’ she said. Most of the plastics now come from the developing economies, mainly in Asia, she added, noting that the Trash Free Seas Alliance, founded by the Ocean Conservancy and supported by the American Chemistry Council, Dow Chemical, P&G and the World Plastics Council as well as several big-name food and beverage companies have recently adopted the goal of launching a $150m fund for waste management in South East Asia.
How we roll. Video: The Ocean Cleanup
Meanwhile, Slat says that the mobile collection systems can also be used to trap plastic pollution closer to the source, for example in rivers and estuaries. Researchers at The Ocean Cleanup estimate that rivers transport between 115 and 241 m t/years of plastic waste into the oceans, with two-thirds coming from just 20 rivers, mostly in Asia.
The Pacific trash vortex forms as a result of circular ocean currents created by wind patterns and the forces created by the Earth’s rotation. Similar gyres are found in the South Pacific, Indian Ocean, and North and South Atlantic.
As another phenomenal Sir David Attenborough-narrated nature documentary draws to a close, many in the UK will be wondering what to do with themselves. The long-awaited Blue Planet II brought viewers on an enchanting journey through the oceans, with jaw-dropping photography capturing this hidden world, from the darkest depths to coral reefs and coasts.
In the final episode, we met Dr Jon Copley, who is Associate Professor in Ocean Exploration & Public Engagement at the University of Southampton. Jon was scientific advisor for Episode 2 (The Deep), which included providing some of the footage shown of deep-sea vent animals, from NERC research projects he was involved with.
Dr Jon Copley pictured during the Blue Planet II expedition to the Antarctic. Image: Jon Copley
Jon also took part in a month-long shoot in the Antarctic, which was shown in the incredible opening of The Deep episode, where Jon and his fellow researchers travelled in a minisub 1km deep into the Antarctic ocean.
We caught up with Jon to find out about the real-world benefits of exploring our oceans, why communicating science matters, and more.
SCI: Some 16 years after the first Blue Planet series was broadcast, viewers were given the opportunity to visit the deep Antarctic ocean in Blue Planet II. What are the challenges in sending a manned craft to the deep Antarctic?
JC: We’ve actually had the technology to explore the Antarctic deep sea with human-occupied vehicles for several decades – Cousteau went there in the early 1970s with his ‘flying saucer’ minisub, which had a depth limit of 400 metres.
But dives by human-occupied vehicles depend on a fairly narrow window of wind, sea, and ice conditions. So the cost of sending such technology to the Antarctic can be a gamble – there’s a risk of not getting many suitable days for sub dives.
Fortunately, better information from satellites monitoring wind, sea, and ice conditions throughout the area allows more careful and adaptive planning of operations – and we depended on that during the Blue Planet II expedition. By being able to choose dive targets in more protected areas, there were only a couple of days when conditions prevented us from launching the subs. And of course the experience and professionalism of the ship’s crew and sub team were key to that success.
SCI: What are the real-world benefits of exploring the deep oceans?
JC: We can learn from the ingenuity of nature in the deep ocean – for example, an antifreeze protein now synthesised to improve storage of ice cream products comes from a deep-sea eelpout fish; materials scientists are investigating the damage-resisting properties of the shell of the ‘scaly-foot snail’ (a new species that I was co-author in describing) to design better crash-helmets, body armour and pipeline protection; there’s a new treatment for early-stage prostate cancer based on the light-sensitive behaviour of bacteria from the ocean floor; and possibly even eye drops in development to treat night blindness, from studying how dragonfish hunt in the inky depths.
Eye drops inspired by the night-hunting dragonfish are under development to prevent night blindness. Image: Marcus Karlsson
SCI: What can we do in our daily lives to protect our oceans, and what role does industry have to play in this?
JC: We don’t each have to become paragons of virtue – just a simple change or two that we can easily make into new habits will help to make a difference for the future of our blue planet. Those changes can be things like carrying your own drinks mug with you instead of needing single-use cups, or getting the ‘sustainable fish app’ from the Marine Conservation Society to help to decide which fish to eat.
But it’s more challenging where our everyday lives are more connected to the oceans than we realise. For example, an average family car produces around 40 milligrams of microplastics per kilometre from tyre wear, and some of those microplastics inevitably end up in waterways and the ocean. So a public transport policy that gives people real alternatives to personal car use, in terms of cost and convenience, is also a policy for a healthy ocean. And employers who support teleworking where possible or appropriate are also actually supporting a healthier ocean.
Industry can play a vital role for ensuring healthy oceans by innovating products and processes that give us real choices and alternatives to old ways of doing things that we now know have an impact on the oceans. And I think we’re starting to see that there is real consumer demand for those choices and alternatives.
SCI: You co-founded SciConnect, a company to train scientists to share their research with the wider public. Do you think that scientists are more conscious today of the importance of communicating their science to a broad audience – and is the public more engaged with science?
JC: Being able to share specialist knowledge with people outside your specialism is essential for scientists to work with colleagues in different disciplines, interact with people in other roles across organisations, report to stakeholders and clients, inform policymakers and practitioners, engage with the media, inspire the next generation – if anything, it’s a more common activity in most scientific careers than just sharing research with peers in your own field. So I think that scientists today are very aware of the value of developing the underlying skills for all those applications.
But it’s a set of skills that are not routinely taught by experienced practitioners as part of scientific training, which is why I co-founded a company to do that, with colleagues who work day-to-day in science communication as writers, broadcasters, and presenters, and who have backgrounds in science so that they appreciate the needs and perspective of those they are training.
Fundamentally, engaging people with your research involves understanding your target audience – for example, the approach that you would take to inform policymakers about the consequences of a research finding is different to how you might try to inspire young people’s interest in science through your work, which makes us realise that there isn’t really a homogeneous ‘public’; outside our own area of specialism, we’re all members of ‘the public’ when it comes to finding out about research in another field.
SCI: Now that the Blue Planet II is over, how would you recommend bereft viewers fill the void?
JC: There are some great ways for anyone to continue pursuing their interest in marine life – for example, there’s the Capturing Our Coast project, which is building a nationwide community of volunteers who get together to survey shores, which helps to monitor changes in distributions of species around the UK.
The University of Southampton also runs a free ‘Massive Open Online Course’ about Exploring Our Oceans, which covers the history, science, and relevance of the oceans to our everyday lives. It’s not a formal course, so there aren’t any exams, and no science background is required – just an interest in finding out more about our ocean world.
So, there you have it – from crash helmets to cancer treatments, exploring the deep allows us not only to learn more about the blue planet, but to improve life for us landlubbers, too!
If you’re interested in learning about how our water and waste is analysed and treated, SCI’s Environment, Health and Safety group is running this event at our London headquarters in March 2018. Early bird fees available until 30 January.
In 1942 the Leverhulme Trust endowed a lecture in memory of the first Viscount Leverhulme, founder of the Lever Brothers
The Lecture is given every three years before the Liverpool and North West Regional Group to promote chemical or technological research or education.
Prof Maitland is the 20th recipient of this prestigious award and gave his lecture on ‘Avoiding catastrophic climate change; Paris 2015 set the targets, can the UK deliver?’.
Read our full write-up on the lecture here.
Geoffrey Maitland (second left) receives his award from Alan Bayliss, Chair of the Board of Trustees, with Trevor Rhodes (left), Chair of SCI’s Liverpool and North West Group, and Sharon Todd, SCI’s Executive Director. Image: Mike Halliday
Reace Edwards, from Chester University, collects her award from Prof Maitland. She is the top scoring second year student on the BEng/MEng Chemical Engineering degree course. Image: Mike Halliday
Oliver Stanfield won his award for highest-achieving third year student on the BSc Chemistry with Industrial Experience course at the University of Bangor. Image: Mike Halliday
Aaisha Patel, from Liverpool John Moores University, is the best second year student on the BSc (Hons) Chemical and Pharmaceutical Science programme. Image: Mike Halliday
The US’ environment agency and Clean Water Act is in trouble. Image: Public Domain Pictures
Budget proposals will slash the US Environmental Protection Agency’s funding by almost a third, and its workforce by 20%, quite apart from a major refocusing of its agenda. The new EPA administrator Scott Pruitt – whose time as attorney general in Oklahoma was notable for its opposition to environmental measures and the filing of multiple lawsuits against EPA – has certainly hit the ground running.
In contrast to Trump, Pruitt is actually getting stuff done, often going over the heads of his own staff. Planned regulations such as the chemical accident safety rule and a rule covering methane leaks from oil and gas wells have been delayed. Others have been reversed, including a ban on the neurotoxic pesticide chlorpyrifos, flying in the face of scientific advice from his own agency.
Trump faced harsh criticism from several nations after pulling out of the Paris Agreement. Image: Gage Skidmore@Flickr
Other moves come in response to executive orders from the president. Trump’s earlier criticism of Obama’s use of executive orders hasn’t stopped him from throwing them around like confetti – in his first 100 days, he signed almost as many as Obama averaged in a year.
For example, at the end of February, he signed one requiring a review of the Waters of the United States (WOTUS) rule, which defines what constitutes navigable waters. This might sound obscure, but it led to the EPA announcing at the end of June that it will rescind the 2015 Clean Water Rule.
‘WOTUS provided clarity on what bodies of water are subject to protections under the Clean Water Act,’ said Massachusetts congressman Mike Capuano. Essentially, the 2015 definition extended its scope to bring small waterways such as wetlands and streams under federal environmental rules, and not just big rivers and lakes.
‘The federal government won’t have the authority to regulate pollution in certain waterways because they don’t qualify under the EPA’s new definition,’ Capuano continued. ‘This will surely impact drinking water in many communities all across the country, since 117m Americans currently get their drinking water from small streams.’
EPA even published a press release that featured multiple quotes from Republican governors, senators and representatives across the country supporting the move. Quotes from those like Capuano – who believe it is a step backwards in water safety – were notable by their absence.
Seven US scientific societies wrote to Trump condemning his actions. Image: Max Pixel
So is mention of any scientific rationale. A letter from US scientists, drafted by conservation group American Rivers, states that the Clean Water Rule was developed using the best available, peer-reviewed science to clarify which bodies of water are, and are not, protected under the act. Importantly, it says that tributaries, intermittent streams and waters adjacent to them such as wetlands, are protected because of their physical, chemical and biological connections to navigable waterways. ‘We are disappointed that the current Administration has proposed dismantling the Rule with minimal consultation and without scientific justification,’ it says.
Much has been made of Trump’s withdrawal from the Paris Climate Agreement, but that’s not the only signal that the air in the US is set to get dirtier. An executive order on energy independence signed by Trump at the end of March 2017 led to an instant response from EPA that it would review the Clean Power Plan. The order asked the various agencies to submit plans to revise or rescind regulatory barriers that impede progress towards energy independence, as well as wiping out several of Obama’s executive orders and policies in the field of climate change.
Experts are worried that US air and water will become dirtier. The country is already the second biggest contributor to climate change in the world. Image: Pixabay
Top of the list for a potential resurgence: dirty energy. EPA has been directed to review, revise and rescind regulations that ‘may place unnecessary, costly burdens on coal-fired electric utilities, coal miners, and oil and gas producers’.
‘Our EPA puts America first,’ claimed Pruitt. ‘President Trump has a clear vision to create jobs, and his vision is completely compatible with a clean and healthy environment. By taking these actions today, the EPA is returning the agency to its core mission of protecting public health, while also being pro-energy independence.’
Many others beg to differ, including New Jersey senator Cory Booker. ‘It’s simply shameful that President Trump continues to put the interests of corporate polluters ahead of the health and safety of New Jersey families,’ he said. ‘The Administration’s repeated denial of clear science and proposed gutting of the EPA jeopardises the welfare of all Americans.
‘Under no circumstance should we allow the fundamental right of each and every American to live in a safe and healthy environment be undermined by such destructive and irresponsible policies.’
In the developed world, we have seen huge steps in prioritising our environment. The UK are just one of the many nations setting an example for a greener lifestyle, after they announced a diesel and petrol car ban on all UK roads by 2040. Worldwide, countries are introducing hefty fines to companies for irresponsible and harmful acts against the environment, which include deforestation and pollution.
It is hard to forget the BP Deepwater Horizon spill that devastated the Gulf of Mexico in 2010, which killed 11 people and harmed or killed 82,000 birds, 6,165 sea turtles, and 25,900 marine animals. At the time BP’s CEO Tony Hayward said the spill was ‘relatively tiny’ compared to the ‘very big ocean’; 205.8m gallons of oil was spilled.
The Deepwater Horizon disaster was the worst marine oil spill in history. Image: US Department of Defense
In 2015, BP were told to pay a record $18.7bn fine to the US justice department and the five effected US states – Alabama, Florida, Louisiana, Mississippi, and Texas – that sued the company for damages after the spill. The settlement is being used to fund clean-up projects. However, fines cannot be the only way to enforce environmental measures on companies, as the system does not always succeed.
One of the biggest hurdles in promoting sustainability and environmentalism is teaching industry how they can remain working productively, but in an environmentally-conscious and responsible way, as too often compromises to become greener are easily ignored. Of course, it is unrealistic to expect companies to completely reinvent their daily operations, so experts need to provide realistic steps that industry can take to become greener.
Encouraging corporate sustainably is no purely a question of morality but a sensible business move. Evidence shows that 66% of consumers are willing to pay more for goods made sustainably and companies who show a commitment to the environment have also seen a global growth of 4% in sales compared to 1% of organisations who do not identify as environmentally-friendly.
Setting the standard
Unilever, whose brands include Dove and Magnum, are at the forefront of this movement. An industry giant in food and beverages, cleaning products, and toiletries, Unilever have made sustainability a part of its corporate identity.
Unilever are leading industry into a greener future. Video: Unilever
The company’s Sustainable Living Plan has surpassed industry standards. They have developed a sustainable agriculture programme that helps farmers and suppliers worldwide increase their productivity while respecting the environment they work in, as well as aiming towards a ‘circular economy’ within Unilever that will reduce waste by recycling materials to be used in other parts of the supply chain.
The company’s efforts were recognised in 2015 by the United Nations, who presented Unilever CEO, Paul Polman, with its Champion of the Earth Award for ‘his ambitious vision and personal commitment to sustainability.’
Plastic collects at the mouth of the Los Angeles River, California, US. Image: Plastic Pollution Coalition@Flickr
One of the core aims of Unilever’s circular economy is to use 100% recyclable plastic packaging by 2025, a step that has pleased researchers. ‘At the current rate, we are really heading towards a plastic planet,’ says Rolan Geyer, an industrial ecologist at the University of California, US, whose paper on the fate of all plastics over time hit headlines this year.
Of the 9.1bn tons made so much by industry, nearly 7bn is no longer used and only 9% has been recycled, the study reports. ‘The growth is astonishing and it doesn’t look like it’s slowing down soon,’ says Geyer.
Concrete is a common fixture in the building blocks of everyday life. Image: US Navy@Wikimedia Commons
Concrete is the most widely used construction material in the world, with use dating back to Ancient Egypt.
Predictably, our needs concerning construction and the environment have changed since then, but the abundance of concrete and its uses have not. We still use concrete to build infrastructure, but building standards have changed dramatically.
Dubai city landscape. Concrete is predominantly used in residential buildings and infrastructure. Image: Pixabay
Its immense use, from house foundations to roads, means that problems cannot easily be fixed through removal of the old and replacement with the new. Such constraints have seen researchers focus on unique ways to solve the problems that widespread use of concrete can create for industry.
In the UK, four universities have created ‘self-healing’ concrete as part of a collaborative project, known as Resilient Materials 4 Life (RM4L), to produce materials that can repair themselves. Currently, monitoring and fixing building materials costs the UK construction industry £40 billion a year.
Microcapsules are mixed through the cement which then break apart when tiny cracks begin to appear. The group have also tested shape-memory polymers that can close the cracks together closely and prevent further damage. These techniques have shown success in long-term trials and in scaled-up structural elements, said Prof Bob Lark, speaking to Materials World magazine. Lark is lead investigator for RM4L at Cardiff University.
RM4L already has 20 industry partners and there is hope that, in the future, technologies can be transferred to other materials, although it has not yet reached the commercialisation stage.
Lark said: ‘What we have to do now is improve the reliability and reduce the cost of the techniques that we have developed so far, but we also need to find other, more efficient and perhaps more tailored approaches that can ensure we address the full range of damage scenarios that structures can experience.’
Making concrete eco-friendly
The abundance of concrete globally comes with an equally large carbon footprint, with concrete production equating to 5% of the annual CO2 produced by humans. For every tonne of concrete made, we contribute one tonne of CO2 to our surroundings. It is primarily due to the vast quantity produced each year that leads to this high level of environmental damage, as concrete is otherwise a ‘low impact’ material.
This inherent characteristic has led some scientists to develop stronger types of concrete. Here, the building features and low environmental impact of the material remain the same, but because less is needed of the stronger concrete to perform the same job, carbon emissions are reduced significantly.
Another method aimed at tackling emissions is the ‘upcycling’ of concrete. At UCLA, researchers have created a closed-loop process by using carbon capture from power plants that would be used to create a 3D-printed CO2NCRETE.
‘It could be a game-changer for climate policy,’ said Prof JR DeShazo, Director at the Luskin Centre for innovation, UCLA. ‘It takes what was a problem and turns it into a benefit in products and services that are going to be very much needed and valued in places like India and China.’
Cellular agriculture involves making food from cell cultures in bioreactors. The products are chemically identical to meat and dairy products, and it’s claimed they have the same taste and texture.
The technology is an attractive option because it would reduce the world’s reliance on livestock, which is unsustainable, and would have potential knock-on benefits of lower greenhouse gas emissions, and reduced water, land, and energy usage than traditional farming.
IndieBio helps biotechnology start-ups. Since 2014, it has funded several new US-based businesses in cellular agriculture: Perfect Day, formerly Muufri, makes milk from cell culture; Clara Foods is developing a way to make egg whites from cell culture; and Memphis Meats is focusing on animal-free meat using tissue engineering.
Growth is driven by the clear benefits this technology can offer, says Ron Sigeta, IndieBio’s Chief Scientific Officer. ‘It takes 144 gallons of water to make a gallon of milk or 53 gallons of water to make an egg. Cellular agriculture products don’t require such large water supplies, or large tracts of land, or produce the same level of greenhouse gas emissions.’
Salmonella bacteria are not present in cell-cultured milk so there is no risk of infection. Image: Wikimedia Commons
Food safety is also a significant issue. ‘Cellular agriculture makes products in an entirely controlled environment so it’s a source of food we can understand with a transparency that is simply not possible now,’ says Sigeta. For example, raw, unpasteurised milk can carry bacteria, such as salmonella, which is not a problem for Perfect Day’s milk as there are no bacteria-carrying animals are involved.
So how does it work?
Cellular agriculture products can be acellular – made of organic molecules like proteins and fats – or cellular – made of living or once-living cells.
Meat industry critics argue that it is not sustainable and lab-grown meat is the future. Video: Eater
Acellular products are made without using microbes like yeast or similar bacteria. Scientists alter the yeast by inserting the gene responsible for making the desired protein. Since all cells read the same genetic code, the yeast, now carrying recombinant DNA, makes the protein molecularly identical to the protein an animal makes.
Other products like meat and leather are produced by a cellular approach. Using tissue engineering techniques muscle, fat or skin cells can be assembled on a scaffold with nutrients. The cells can be grown in large quantities and then combined to make the product.
The first cultured beef patty was made in 2013. Image: Public Domain Pictures
Mark Post at Maastricht University, the Netherlands, made the first cultured beef hamburger in 2013 using established tissue engineering methods to grow cow muscle cells. The process, however, was expensive and time-consuming, but his team has been working on improvements.
‘We are focusing on hamburgers because our process results in small tissues that are large enough for minced meat applications, which accounts for half of the meat market. To make a steak, one would need to impose a larger 3D structure to the cells to grow in.
‘It is very important that such a structure contains a channel system to perfuse the nutrients and oxygen through to the developing tissue and to remove waste as a result of metabolic activity. This technology is being developed, but is not yet ready for large scale production.’
Surveys have shown that the public are behind genetically engineered meat alternatives. Image: Ben Amstutz@Flickr
Commercial challenges include finding a cost-effective medium for cell nutrition developing a bioreactor for industrial scale production. Public perception may also be a challenge: Will people buy synthetically engineered food?
A recent crowdfunding campaign shows the global massive support for the idea of clean meat, says Koby Barak, SuperMeat’s chief operating officer and co-founder. However, he believes these will be overcome shortly, and it will not be long before companies see ‘massive funding’ in this field and the creation of clean meat factories worldwide.