Cabot Institute for the Environment blog – A blog about environmental research at University of Bristol

Why climate activists keep targeting art galleries – despite public outcry

Posted on October 4, 2024 by amanda.woodman-hardy

Two Just Stop Oil activists were recently jailed for 27 months and 20 months respectively for throwing soup at one of Vincent van Gogh’s Sunflowers paintings at London’s National Gallery back in October 2022. Some commentators suggested these were overly harsh sentences for a nonviolent protest, while others felt such sentences were appropriate and an important deterrent.

We study activism and its impact (and sometimes have participated in direct actions like these). In our latest research, we looked at 42 climate protests at museums and art galleries in Europe, the US, Canada and Australia between 2022 and 2024. We wanted to know what makes this form of protest so unpopular with the general public, and why climate activists have continued to return to galleries despite, or even because of, the resulting social outrage.

As it happens, we published our work in the journal Protest just a few days before the Just Stop Oil activists were sentenced.

One common theme we found is that such protests are widely criticised because of their supposed irrationality. For instance, in his sentencing remarks in the Sunflowers case, Judge Christopher Hehir spoke for many when he described the soup-throwing action as “criminally idiotic”.

However, we should consider the logic offered by the activists themselves. The video of the action in October 2022 shows one of them, Phoebe Plummer, asking: “What is worth more – art or life? Is [art] worth more than food, more than justice?”

Soup on Sunflowers (2022)

The judge claimed these words revealed “how little the [protesters] cared about Van Gogh’s Sunflowers, or art generally”. This seems an odd misunderstanding. The question of which is worth more – art or life – only warrants interest because the value of life is being compared to objects that are considered to be the most valuable products of human culture. We wouldn’t be having this conversation if Just Stop Oil had thrown soup over a less-heralded artwork.

Why is (apparent) art destruction so powerful?

Throwing soup at paintings is extremely unpopular. We recently commissioned a YouGov poll in which 2,048 representative members of the public were asked about 15 different forms of climate protest. Throwing food at paintings was considered the least justifiable of these protests – less justifiable than sabotaging pipelines, damaging private jets or breaking windows at companies financing oil exploration.

The extreme unpopularity of throwing soup at Sunflowers virtually guaranteed that it would have an audience of millions. Although commentators worried that such an unpopular action would turn people away from the cause, there is no evidence for such an impact. The public may hate the messengers and their actions, but they’re nevertheless exposed to the message.

Indeed, we suspect the reason activists target art is directly related to why it is so unpopular. In academic psychology, terror management theory suggests that damaging revered cultural symbols threatens the psychological defences we rely on to mitigate existential fears.

Think of how memorials are built to soldiers who die in war, to offer them a form of symbolic immortality (“they shall not grow old”), and the way any threat to desecrate such memorials is met with strong condemnation.

Masterpieces like Sunflowers offer a similar sense of immortality and permanence. In a way, our veneration of his work means that Van Gogh is still alive, and its preservation means our culture will live on after our own demise. This explains why the apparent destruction of art provokes such a strong backlash, and why activists use the spectacle to draw parallels between cultural and environmental preservation.

It seems the symbolic value of the painting was an important factor in Judge Hehir’s sentencing. In his words:

It is not the value of the damage caused to the frame that is the most serious aspect of your offending … [Van Gogh’s] work is part of humanity’s shared cultural treasure … you came within the thickness of a pane of glass of irreparably damaging or even destroying this priceless treasure, and that must be reflected in the sentences I pass.

Punishment should fit the crime

Another YouGov poll conducted in July 2023 found fewer than 30% of the UK public think prison sentences are appropriate for nonviolent protesters; only 6% favour sentences of “more than a year in prison”. Over twice as many (15%) don’t believe there should be any punishment for nonviolent protest.

The appropriate punishment for radical dissent should be a matter of concern for all of us. Punishment is not only about retribution. It also communicates societal disapproval. Judge Hehir said: “Sentences must be imposed which both adequately punish you for what you did, and what you risked, and which will deter others whose motivations may incline them to similar behaviour.”

In the immediate aftermath of the sentencing of Plummer and her co-defendant Anna Holland, another three Just Stop Oil activists visited the same gallery in London. They have been charged with criminal damage after soup was thrown at the protective glass of two other paintings by Van Gogh.

Solidarity protests happened in Norway, Sweden, Canada and Germany. Rather than deterring activists, in the immediate term the sentencing seemed to backfire by causing more protests.

These protests trigger a powerful desire for punishment and condemnation. But society would benefit from a sincere attempt to understand the rationale and motivations of those activists who seem to go beyond the normal bounds of protest. Deterrence will not work for those who are acting by their own moral imperatives. It will not stop those climate activists who are drawn to radical symbolic action in order to interrupt the “business as usual” that is leading toward the destruction of both art and life.

This blog is written by Alexander Araya López, Postdoctoral research fellow, University of Potsdam and Cabot Institute for the Environment member Colin Davis, Chair in Cognitive Psychology, University of Bristol. This article is republished from The Conversation under a Creative Commons license. Read the original article.

Earth’s greatest mass extinction 250 million years ago shows what happens when El Niño gets out of control – new study

Posted on September 20, 2024 by amanda.woodman-hardy

252 million years ago, there was only one supercontinent: Pangaea.
ManuMata / shutterstock

Around 252 million years ago, the world suddenly heated up. Over a geologically brief period of tens of thousands of years, 90% of species were wiped out. Even insects, which are rarely touched by such events, suffered catastrophic losses. The Permian-Triassic mass extinction, as it’s known, was the greatest of the “big five” mass extinctions in Earth’s history.

Scientists have generally blamed the mass extinction on greenhouse gases released from a vast network of volcanoes which covered much of modern day Siberia in lava. But the volcanic explanation was incomplete. In our new study, we show that an enormous El Niño weather pattern in the world’s major ocean added to climate chaos and led to extinctions spreading across the globe.

It’s easy to see why volcanoes were blamed. The onset of extinction coincides almost perfectly with the beginning of the second phase of volcanism in the region known as the Siberian Traps. This led to acid rain, oceans losing their oxygen and, most notably, temperatures beyond the tolerance levels of almost all organisms. It was the greatest episode of global warming in the past 500 million years.

The world 252 million years ago

Map of world with one big supercontinent — Alex Farnsworth

However, there were outstanding questions for proponents of this seemingly simple extinction scenario: when the tropics became too hot, why did species not just migrate to cooler, higher latitudes (as is happening today)? If warming was sudden and rapid, why did species on land die off tens of thousands of years before those in the sea?

There have also been many instances of volcanic eruptions of similar scale, and even other episodes of rapid warming, but why did none of these cause a similarly catastrophic mass extinction?

Our new study reveals that the oceans rapidly heated up all across the world’s low and mid latitudes. Normally, it gets cooler as you move away from the tropics, but not this time. It simply became too hot for life in too many places.

A world prone to extremes

Using a state-of-the-art computer program, we were able to simulate what the weather and climate was like 252 million years ago. We found that, even before the rapid warming, the world would have been prone to extremes of temperature and rainfall.

That’s a consequence of all the land at the time forming into one large supercontinent, Pangaea. This meant that the climates we see today at the centre of continents – dry, with hot summers and freezing winters – were magnified.

Pangaea was surrounded by a vast ocean, Panthalassa, the surface of which would fluctuate between warm and cool periods over the years, much like the El Niño phenomenon in the Pacific today. Yet once the mass Siberian volcanism started and carbon dioxide in the atmosphere increased, those prehistoric El Niños became more intense and lasted longer thanks to the larger Panthalassa ocean being able to store more heat.

An El Niño far stronger than anything today

chart of el nino fluctuations — Change in sea surface temperature (SST) compared to the long-term average. El Niño conditions are red, La Niña (or its prehistoric equivalent) is blue. Left = modern day pre-industrial Pacific Ocean. Centre = 252 million years ago, before the Siberian Traps volcanism. Right = at the peak of the mass extinction.
Alex Farnsworth

These El Niños had a profound impact on life on land, and kicked off a sequence of events that made the climate more and more extreme. Temperatures got hotter, especially in the tropics, and huge droughts and fires caused tropical forests to die off.

This in turn was bad news for the climate, as less carbon was stored by trees, allowing more to linger in the atmosphere, leading to further warming, and even stronger and longer El Niños.

252 million years ago, pre crisis:

Animated map of temperature 252m years ago — Before the Siberian Traps volcanism 252 million years ago, the world was slightly hotter than today. (Animation shows average monthly temperatures according to the authors’ climate model).
Alex Farnsworth

These stronger El Niños caused the extreme temperatures and droughts to push outside of the tropics towards the poles, and more vegetation died off and more carbon was released. Over tens of thousands of years, extreme temperatures spread over much of the world’s surface. Eventually, the warming began to harm life in the oceans, particularly tiny organisms at the bottom of the food chain.

…and at the peak of the extinction:

During the peak of the crisis, in a world that was already warming thanks to volcanic gases, an El Niño would boost average temperatures by a further 4°C. That’s more than three times the total warming we have caused over the past few centuries. Back then, the El Niño-charged climate would have regularly seen peak daytime temperatures on land of 60°C or more.

The future of El Niño

In recent years El Niños have caused major changes to rainfall and temperature patterns, around the Pacific and even further afield. A strong El Niño was a factor in record-breaking temperatures through 2023 and 2024.

Fortunately, such events typically only last a few years. However, on top of human-caused warming, even these smaller scale El Niños of the present day may be enough to push fragile ecosystems beyond their limit.

El Niño is predicted to become more variable as the climate changes, though we should note that the oceans are still yet to fully respond to current warming rates. At present, nobody is forecasting another mass extinction on the scale of the one 252 million years ago, but that event provides a worrying snapshot of what happens when El Niño gets out of control.

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This blog is written by Dr Alex Farnsworth, Senior Research Associate in Meteorology, University of Bristol; David Bond, Palaeoenvironmental Scientist, University of Hull, and Paul Wignall, Professor of Palaeoenvironments, University of Leeds. This article is republished from The Conversation under a Creative Commons license. Read the original article.

Building resilience of the UK food system to weather and climate shocks

Posted on September 11, 2024 by amanda.woodman-hardy

Climate-driven changes in extreme weather events are one of the highest-risk future shocks to the UK food system, underlining the importance of preparedness across the food chain. However, the CCC’s 2023 report on adaptation progress highlighted that current climate adaptation plans and policies, and their delivery and implementation for UK food security are either insufficient or limited. Through an ongoing Met Office cross-academic partnership activity (‘SuperRAP’) working across all eight partner universities (including Bristol), Defra, the Food Standards Agency, UKRI-BBSRC and the Global Food Security Programme, a recent perspective paper, and associated online workshops and surveys in January 2023 have:

Scoped out the direct impacts of weather and climate extremes on the UK food supply chain,
Highlighted areas where weather and climate information could support resilience across time and space scales through decision making and action,
Identified key knowledge gaps,
Made recommendations for future research and funding, and
Scoped out the potential adaptation/policy responses to the direct impacts of weather and climate extremes on the food chain, and the resulting trade-offs and consequences

The potential for weather and climate information to support decision making in agricultural and food system-related activities, and improved resilience to weather and climate shocks across time and space scales. Grey background boxes represent generalised meteorological capabilities; light blue ellipses with white outlines denote potential applications. © Crown Copyright 2021, Met Office. From Falloon et al. 2022.

However, a major gap remains in understanding the changes needed to rapidly increase the delivery and implementation of climate adaptation in support of resilience in the UK food system. A workshop on this topic was held at the University of Reading’s Henley Business School on 13-14 June 2024 bringing together academics across a wide range of disciplines and presented findings back to industry and government stakeholders for their feedback and prioritisation.

The workshop aimed to consider key areas for supporting resilience and adaptation to climate change identified by the January 2023 workshop including innovation and trialling novel management and production approaches, social innovation and enabling behavioural shifts, mutual learning, and underpinning evidence gaps. The workshop was supported by a cross-sector survey on adaptation barriers and priorities.

Overarching themes identified in the workshop included the need for a strategic, system-wide, and long-term approach, underpinned by strong inter- and transdisciplinary collaboration.

Critical evidence gaps include improving understanding of:

Impacts of international dimensions and trade on UK food ingredient and packaging availability, compared to UK-sourced products – and their interactions
Impacts of climate extremes on production and transport and effective adaptation options
Impacts of climate shocks on UK livelihood systems, households and consumers
Broader adaptation and transformation needed to escape existing ‘doom loops’
Application of tech solutions (e.g. GM/gene editing) for climate resilience and adaptation

Other issues raised included thresholds for change, land pressures, substitutability of different foods, impacts of government policy, nutrition, regenerative practices, and interactions with the energy sector.

Recommended ways forward include:

Tools, models, and methods that consider risks across the food chain and system outcomes
A focus on inter- and trans-disciplinary approaches.
Increased international collaboration/cooperation, and stronger government-science interactions
Enhancing food chain data access, use and integration, and a supportive enabling environment
Long-term trials: to provide evidence of impacts of alternative practices
Preparing the transport network for climate extremes.
A refresh of the National Food Strategy, building on latest science
A new funding landscape: long-term, strategic, visionary, systemic, trans- and interdisciplinary, co-designed and coordinated.

Other issues raised included: sharing responsibility and joined-up, transparent approaches across sectors and institutions; risk mitigation tools; use cases and roadmaps; welfare responses; interdisciplinary skills training; and research across a wider range of crops.

We are aiming to produce a peer-reviewed perspective paper on critical research (and practice) gaps, and recommendations for the way forward.

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This blog was written by Professor Pete Falloon from the Cabot Institute for the Environment and Met Office.

A bald headed man smiling with dark rimmed glasses. — Professor Pete Falloon

Chemical industry failing to stop emissions of super-strong greenhouse gas HFC-23 – new research

Posted on September 4, 2024September 4, 2024 by amanda.woodman-hardy

The potent greenhouse gas HFC-23 is emitted from the industrial production of fluoroplastics and specific refrigerants.
Quality Stock Arts/Shutterstock

Emissions of a super-strong greenhouse gas could be substantially reduced if factories would properly implement existing “destruction technology” in certain industrial production processes. If operated properly, emissions of this greenhouse gas could be cut by at least 85% – that’s equivalent to 17% of carbon dioxide emissions from global aviation.

Our research, published today in the journal Nature, scrutinises emissions of one of the most potent hydrofluorocarbon (HFC) greenhouse gases, called trifluoromethane (HFC-23). One gram of HFC-23 in the atmosphere contributes as much to the greenhouse effect as 12kg of carbon dioxide.

This unwanted byproduct comes from the production of certain gases used as refrigerants and the manufacture of fluoropolymers (a class of plastic chemicals) such as polytetrafluoroethylene (PTFE), a key ingredient in most non-stick cookware.

black frying pan, single friend egg, dark background. — Fluoroplastics are used in the production of non-stick cookware.
J.Thasit/Shutterstock

More than 150 countries have pledged to significantly reduce their HFC-23 emissions as part of the 2016 Kigali Amendment to an international treaty called the Montreal Protocol on substances that deplete the ozone layer. The breakdown of HFCs in the atmosphere does not directly link to ozone depletion, but HFCs were introduced to replace ozone-depleting substances such as chloroflourocarbons (CFCs), so they have been included in this regulation.

HFCs are also strong greenhouse gases. While the Kigali Amendment aims to reduce emissions of widely used HFCs, an exceptional arrangement is made for HFC-23. Because HFC-23 is largely emitted from production processes and not from end-use applications, its destruction as a by-product is required “to the extent practicable” as of 2020 – that means as much as possible, but it’s a vague limit.

Even before 2020, many countries, including the biggest manufacturers of PTFE such as China, reported they had installed destruction technologies at PTFE factories and are successfully destroying HFC-23. In 2020, the reported global annual emissions of HFC-23 were only around 2,000 metric tonnes – but actual global emissions, derived from atmospheric measurements, amounted to around 16,000 metric tonnes.

To unravel this discrepancy between real and reported emissions, we analysed HFC-23 emissions from a major European PTFE factory in the Netherlands, which already operates destruction technologies – these include the incineration of harmful byproducts.

The aim of our experiment was to define what “practicable” actually means, and to identify how much HFC-23 can be easily destroyed by existing technology at a factory-wide scale, considering that emissions come from both the chimneys and leaks from other parts of the plant.

With the factory’s collaboration and the consent of the Dutch environment authorities, we released a controlled amount of a tracer gas directly next to the factory: this is a non-toxic, degradable gas that does not occur in the atmosphere. We then measured the concentrations of HFC-23, other byproducts of flouropolymer manufacture, and the released tracer at an observing site run by the Europe-wide greenhouse gas research centre, the Integrated Carbon Observation System, near the Dutch village of Cabauw.

This 213m-tall tower is located around 25km away from the factory. We knew exactly how much tracer we had released and how much of it arrived at the measuring point, so we could calculate the emissions of HFC-23 and other gases.

aerial shot of tall metal tower, green fields — Measurements of HFC-23 and the tracer were carried out at the 213m Cabauw measuring mast, operated by the Royal Netherlands Meteorological Institute.
ICOS RI/Tom Oudijk, Sander Karsen, Dennis Manda, CC BY-NC-ND

Results showed that even though our estimated emissions were higher than those reported by the factory, the technology at this particular factory was working properly and successfully destroying HFC-23.

Upscaling to global emissions

However, as the industrial manufacture of fluoropolymers is currently the major known source of HFC-23 to the atmosphere, we suspect that destruction technologies are not as effectively operated as reported by manufacturers.

Our findings indicate that if all factories globally were controlling emissions in the same way as the Dutch site, HFC-23 emissions could be cut by at least around 85%, representing emissions equivalent to 170 million metric tonnes of carbon dioxide per year. This reduction equates to almost one-fifth (17%) of carbon dioxide emissions generated by all aviation traffic.

Real and reported emissions of HFC-23

An independent auditing framework for fluoropolymer production would ensure that HFC-23 is destroyed properly at factories around the world. Targeted monitoring of greenhouse gas emissions resulting from the production of fluorochemicals would further the understanding of emission sources and ensure that countries are fully compliant under different international climate and environment agreements.

Our results show that destruction technologies can effectively be implemented – in this case, at factories producing fluoropolymers such as PTFE, to significantly reduce the emissions of a highly potent greenhouse gas.

This blog is written by Dr Dominique Rust, Research Associate, School of Chemistry, University of Bristol; Dr Kieran Stanley, Senior Research Fellow, School of Chemistry, University of Bristol, and Stephen Henne, Senior Scientist, Group Atmospheric Modelling and Remote Sensing, Swiss Federal Institute of Technology Zurich. This article is republished from The Conversation under a Creative Commons license. Read the original article.

How fly fishing strengthens our connection with wildlife and fosters conservation efforts

Posted on August 21, 2024 by adele.hulin

Whether it’s to reset our mental health or simply to take time out from the hurly-burly of work and urban life, many of us head for oceans and rivers to enjoy their restorative capacities.

Encountering wild animals in these blue spaces contributes to the beneficial effects of being in nature and forms the basis of tourist economies the world over.

Yet, how does our presence affect the creatures that call blue spaces home, and how do encounters with wild species change our relationships with natural environments?

River and stones with green trees and shade — The River Lyd, Devon. Avi Shankar

For nearly a decade, we have been researching human interactions with wild trout and salmon in the context of fly fishing. We spent months immersed in river environments both in the UK (the Lyd and Tamar in Devon, and the Usk and Wye in Wales) and North America (the rivers of the Gaspe region, Quebec and Lewisburg, Pennsylvania). We went fishing, observed and interviewed fly fishers, and learned as much as we could about fish behaviour.

In our recent paper, we explain how human interactions with fish can result in three kinds of interspecies encounters that strengthen people’s connections with wildlife and natural environments.

Separated encounters

Most often, wild animals remain indifferent to humans, driven as they are by natural motivations to feed and breed, within environmental habitats that humans do not fully understand.

For instance, Duane, a novice fly fisher we interviewed in Pennsylvania, didn’t know that trout eat aquatic insects: “I didn’t know squat … flies actually come out of the water?”

This lack of understanding of other species often ensures that wild animals remain undisturbed by human presence. Yet the elusiveness of creatures such as trout and salmon can also motivate people to find out more about them.

Slippery encounters

To improve their chances of catching fish, fly fishers learn about fish behaviour, river environments and the life cycles of the insects that fish feed on.

Equipped with this knowledge, fly fishers become better able to locate trout and salmon, and to select and cast a near weightless imitation “fly” designed to mimic a fish’s insect food.

Learning and honing these skills is a lifelong project during which fly fishers become savvy hunters with heightened abilities to sense what is going on in the water. Equally, fish learn too, becoming shy and ready to slip away from human contact.

Sticky encounters

On the rare occasions that fish are hooked, humans and fish enter what we call a “sticky encounter”. The mixed emotions of catching a wild salmon are captured in Annetta’s field notes:

I look down at this beautiful, majestic being. The fish is a fresh, healthy, silver, bright female … I look at her, she looks back at me … She wrangles free. She’s on a mission to spawn in her home river. I stand up but I’m weak in the knees. Full of pride, humility, and guilt.

Over time, these intense experiences of eye-to-eye contact can inspire fly fishers to consider the welfare of fish.

A wild Usk brown trout in a net — Netted: a wild Usk brown trout – most fly fishers now carefully return their catch back into the river. Avi Shankar

Fly fishers now release the majority of the fish they catch. Moreover, one fly fisher we interviewed explained that he has entirely removed the hooks from his flies, declaring: “I don’t want to catch that fish. I caught so many in my life. I know what the feeling is like.”

Stewarding blue spaces

It may seem ironic that fly fishers become passionate about conserving fish and river environments by practising what many people consider to be a cruel sport. Yet, fly fishers have first-hand experience of declining fish numbers.

Some of our interviewees spoke of trout and salmon as “canaries in the coal mine” – a warning sign of how river ecosystems are threatened by pollution, overdevelopment and climate change. In response, organisations such as the Wild Trout Trust and the Atlantic Salmon Trust highlight the necessity for conservation.

With wild populations of animals declining globally, the presence of humans in blue spaces deserves scrutiny. Nevertheless, interspecies encounters can change the relationship between people, fish and rivers from one of human gratification to one of reciprocity, stewardship and care.

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This blog is written by Professor Avi Shankar, Professor of Consumer Research at the University of Bristol. It is republished from The Conversation under a Creative Commons license. Read the original article.

Avi Shankar standin in the street — Professor Avi Shankar

To address the growing issue of microplastics in the Great Lakes, we need to curb our consumption

Posted on July 26, 2024 by amanda.woodman-hardy

Microplastics in the environment is a growing global problem.
(Shutterstock)

You would be hard-pressed to find a corner of the world free from microplastics, plastic particles measuring less than five millimetres. They contaminate our drinking water, accumulate in the food we eat and have been found in the human body, including in blood, organs, placenta, semen and breast milk.

In April, delegates from across the world came together in Ottawa for the fourth session of the Intergovernmental Negotiating Committee to develop a legally binding international treaty on plastic pollution. The meeting offered a unique opportunity to identify strategies for addressing the human and environmental health impacts of plastics, including microplastics.

But do we really know what it would take to mitigate the rising amounts of microplastics in the environment?

In the Great Lakes, plastic pollution along the shorelines poses a major challenge: 86 per cent of litter collected on Great Lakes beaches is either partially or completely composed of plastic. This is worrisome, given the lakes supply 40 million people with drinking water and represent a combined GDP of US$6 trillion. Yet, recent studies show levels of microplastics reaching up to thousands of particles per cubic metre in some areas of the lakes.

CBC News takes a look at the amount of microplastics in the Great Lakes.

Mismanaged plastic waste

Improving waste management alone is unlikely to address microplastic pollution in the Great Lakes. Consider one of the most common pieces of litter on a beach: a 500 ml plastic bottle. If that bottle is not picked up and placed in a landfill or recycled, over the years it will break down into microplastics; the complete disintegration of the bottle into 100 micrometre size particles would produce 25 million microplastics.

Based on reported concentrations of microplastics and water flow rates of the Great Lakes, we can estimate the yearly amounts of plastic that need to be entering the lakes to match the concentrations of microplastics currently observed.

For Lake Superior, this adds up to the same mass of plastic contained in 1,000 bottles. But Lake Superior is the cleanest of the Great Lakes. For Lakes Huron, Michigan, Erie and Ontario, the corresponding estimates are 3,000, two million, 18,000, and nine million bottles, respectively.

According to the Canadian government’s own estimation, Canadians living in the Great Lakes Basin throw away more than 1.5 million tons of plastic waste each year, equivalent to 64 billion 500 ml bottles. If we include the United States, the total amount of plastic waste in the Great Lakes Basin rises to 21 million tons per year (or 821 billion 500 ml bottles).

For Canada and the U.S., the fraction of mismanaged plastic waste that leaks into the environment because it is not recycled, incinerated or landfilled is estimated to be between four and seven per cent.

According to our calculations, this means that it would take less than 0.001 per cent of the total mass of plastics consumed annually within the Great Lakes Basin to generate the number of microplastics present in the lakes. In other words, just 0.02 per cent of the mismanaged plastic waste already explains the microplastic concentrations in the Great Lakes — the other 99.8 per cent ending up as macro- to micro-sized litter in soils, waterways, ponds, beaches and biota.

plastic rubbish on the ground with driftwood — Plastic garbage on the shore of Lake Erie.
(Shutterstock)

What these calculations imply is that the shedding of even very minor, and arguably unavoidable, microplastic particles over the lifetime of a product can lead to significant accumulations of environmental microplastics, including in areas far removed from their source.

While better plastic waste management can help alleviate microplastics pollution, we should not count on it to bring down the microplastics concentrations in all five Great Lakes.

Curbing pollution

Microplastic pollution comes not only from plastic litter in the environment, but also from plastic that is thrown in the trash bin. Even long-lived plastics, such as those that are used in the construction industry, shed microplastics through natural wear and tear.

Once they enter an ecosystem, microplastics become extremely difficult and expensive to clean up. Recycling is the best option currently available, but even this process has been shown to produce microplastics.

At present, less than 10 per cent of plastic is recycled worldwide. With plastic production predicted to triple by 2060, achieving a fully circular plastic economy — where all plastic produced is recycled without shedding microplastic particles — faces huge economic, social, environmental and technological challenges.

And it would take many years to establish such a system, all while microplastic pollution continues to worsen. If we are serious about reducing microplastics concentrations in the environment, the reasonable course of action would be to start reducing plastic production and consumption now.————————————

This blog is co-written by Cabot Institute for the Environment member Dr Lewis Alcott, Lecturer in Geochemistry, University of Bristol; Fereidoun Rezanezhad, Research Associate Professor, Department of Earth & Environmental Sciences, University of Waterloo; Nancy Goucher, Knowledge Mobilization Specialist, University of Waterloo; Philippe Van Cappellen, Professor of Biogeochemistry and Canada Excellence Research Chair Laureate in Ecohydrology, University of Waterloo, and Stephanie Slowinski, Research Biogeochemist, University of Waterloo

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Indigenous strategies for community engagement to combat climate change in the Amazon

Posted on June 27, 2024 by amanda.woodman-hardy

View of the Tapajós River in the City of Santarém. Credit James Moura.

In the heart of the Amazon Rainforest, a group of young indigenous activists gathered to co-produce strategies for fostering community engagement through audiovisual production to combat climate change. Funded by the Cabot Institute for the Environment and the National Institute of Science and Technology for Amazon Biodiversity Synthesis, the voices of various indigenous peoples found collective strength to develop these strategies in the Lower Tapajós region in the city of Santarém at the Federal University of Western Pará.

This activity took place during the National Seminar of the Tapajós National Forest, which is celebrating its 50th anniversary. The organization of this workshop with young indigenous people began with Kumaruara indigenous leaders who participated in the Amazon Policy Synthesis Project (SynPAm) funded by the Cabot Institute and Policy Bristol at the University of Bristol. This project aimed to identify conservation strategies and gaps in knowledge production related to the Amazon region’s biodiversity. The project involved over 100 stakeholders (researchers, representatives of Non-Governmental Organizations, decision-makers, community leaders, indigenous and quilombola leaders) who engaged in interviews, focus groups, and participatory workshops. One of the suggestions from these various stakeholders was to develop activities where indigenous peoples would also facilitate knowledge production and mobilization processes.

Thus, one of the indigenous activists from the Kumaruara people proposed the development of a participatory workshop to create community engagement strategies through audiovisual production to the Kumaruara Territory Indigenous Council (@povokumaruara). The Indigenous Council collectively deliberated that they could co-facilitate the development of the workshop with the presence of some young indigenous leaders from different territories (see photo below).

Indigenous workshop facilitators. Credit: James Moura.

This activity was the only one co-facilitated by indigenous leaders at the National Seminar. The workshop was conducted collaboratively. The indigenous leaders began with a moment of connection and respect for the sacred spirituality present in the Lower Tapajós territory. With the blessings of the sacred beings, we proceeded to discuss how climate change has been affecting the different territories of the participants. Most of the workshop participants were indigenous people from other ethnic groups, with a small number of non-indigenous participants. A consensus among all present was that climate change is affecting different regions of the Amazon. They commented on how the regions are now drier, hotter, and with fewer fish in the rivers. There is also a greater presence of irregular fires in the region. They pointed out that there is a strong presence of agribusiness, mining, and illegal logging. These factors contribute to the worsening scenario related to climate change.

one of the conversation circle moments during the workshop — One of the conversation circle moments during the workshop. Credit: James Moura.

After this collective sharing moment, it was evaluated how we could produce strategies to promote community engagement to combat climate change. The participants identified that the collective production of audiovisual content could be an important strategy for community mobilization, denouncing human degradation actions in the territories, and raising awareness to fight climate change. The indigenous leaders commented that this struggle is collective. It requires the engagement of both indigenous and non-indigenous people to bring about a transformation in the ways of life of our society. Excessive consumption, waste production, and economic development models were identified as factors promoting global warming. The Kumuaruara indigenous people provided examples of some audiovisual productions they have developed in the territory (see more of these productions here: https://youtu.be/c0atRyk640k?si=Ksnwek1TblnMoPRe; https://youtu.be/i29UR49wwdo?si=3PW5JVKjn_mpf6F9).

Participatory activities took place with the organization of two subgroups, including indigenous and non-indigenous people. They reflected on the need to engage people about the impacts of climate change in the territories. A walk was facilitated on the Campus of the Federal University of Western Pará to identify possible causes and impacts of climate change. Participants reflected on the importance of being attentive to small actions that can increase global warming. They also highlighted the need to understand the impacts of large agribusiness, logging, and mining companies operating in the region. They said that the native forest, along with the rivers, has been destroyed by soybean plantations, cattle raising, illegal logging, and mining activities. Thus, the participants created audiovisual productions demonstrating these relationships, from small personal actions to the significant impacts of the logging, mining, and agribusiness sectors in the region. It is necessary to have a critical and attentive view of the entire production chain to identify whether that specific product being sold in the supermarket is not related to environmental degradation and deforestation in different parts of the world.

video production moment on the UFOPA campus — Video production moment on the UFOPA campus. Credit James Moura

The indigenous peoples of the Amazon, represented by young Kumaruara leaders, call on everyone to combat climate change through daily actions. These actions involve raising awareness of the impacts of climate change on our lives. They highlight the need to compare our contexts over the years and evaluate temperature, vegetation, and climatic events. Furthermore, with this more attentive understanding, we must change habits in a more sustainable and supportive way. Thus, we must understand the production chain of manufactured products and identify if a particular company has been associated with environmental degradation actions. Similarly, we should reduce our need to consume these products and try to consume with less excess. Finally, we must support the actions of indigenous communities worldwide and in the Amazon, which have historically worked on environmental conservation and mitigating climate change.

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This blog is written by Cabot Institute for the Environment members Dr James Moura, Community psychologist, Senior Research Associate of the Synthesis for Policy in Amazonia in the School of Biological Sciences; Dr Filipe França, Lecturer in the School of Biological Sciences; and Dr James Palmer, School of Geographical Sciences, University of Bristol.

Left to right: James Moura, Filipe Franca and James Palmer

On track for change: how to travel more sustainably to European conferences

Posted on June 24, 2024 by amanda.woodman-hardy

Train station at Bonn — Train station on the journey to Bonn

A significant part of the University’s carbon footprint comes from business travel and the Sustainability Team has published a Business Travel Toolkit to help staff choose the most appropriate and low carbon option. That’s why we were thrilled to hear about Alix Dietzel’s recent trip to Bonn Climate Conference, where she opted to travel by rail over flying. We caught up with her to find out how it went, and hopefully inspire more of our research community to do the same!

Can you share your reasons for going to the conference?

“I went to Bonn to observe the climate change negotiations ahead of the next Conference of the Parties (COP29) in Azerbaijan. These ‘intersessional’ negotiations mark the halfway point between COPs and it is a good chance to see what is on the table at the next COP, where we are after COP28 and what the major sticking points are. In addition, this year Dr Alice Venn, Dr Katharina Richter and myself, got the chance to present a ‘side-event’, which was selected from over 400 applications by the UNFCCC. We teamed up with C40 cities, Green Africa Youth Organization and the Youth Climate Change Council Alliance to discuss how to pursue inclusive urban climate policies.”

Why did you decide to travel by rail?

“My main consideration was the emissions. Bonn is 8-10 hours away by train – about the same amount of time it took me to get to Dubai by plane for COP28. I avoid flying when I can, but sometimes it is unavoidable due to practicalities. In this case, I was able to add two travel days to my itinerary by only attending the conference for four days. I don’t like to leave my four-year-old daughter for longer than a week – she needs me. I’m privileged to have her in full-time nursery and am married to a very involved father, which made it possible to leave for this long.”

Can you tell us about the journey?

“I did a four-leg journey. Bristol to London (1.5 hours), London to Brussels (2 hours), Brussels to Cologne (2 hours) and finally Cologne to Bonn (half an hour).

In terms of comfort, I preferred the train journey to flying! I’m quite tall and train seats are roomier, especially the Eurostar and ICE trains in Germany. There’s also free Wi-Fi, multiple plugs for charging, plenty of room for a laptop, and it’s easier to get up and buy snacks or stretch your legs on the train than on a plane.

The changes between trains were great for getting fresh air and trying foods from different countries. I haven’t been to three countries in one day before, and that is a perk – having lunch in London, a coffee break in Brussels and then dinner in Germany was a culinary treat!

I missed one connection due to a delayed train from London to Brussels, which meant I queued for 20 minutes to get a special ticket from the Eurostar counter. I was only delayed by an hour and it didn’t cost me any more money.”

Alix Dietzel at the Bonn climate change conference

How was your experience at the conference?

“I really enjoyed watching the intersessional negotiations because they felt more relaxed, honest, and open compared to the COPs where there is a lot of pressure to find agreement. It’s also a space where you can approach negotiators more easily, because things are less hectic. For example, I was able to have a chat with a UK negotiator and share a bit about my research with him between negotiations.

It’s much smaller than a COP. COP28 had 100k people present and sprawled over a huge venue that has not only the negotiations, but ‘exhibition spaces’ which have events, meaning at times there are about 400 talks at once you could attend! SB60 had 8,600 people and was contained in a single building. This makes it much easier to navigate and focus on the negotiations, with only 5-10 events overlapping at any one time.”

What would you say to colleagues considering land-based business travel instead of flying?

“Try it! Speak to the University’s business travel booking team at Clarity and consider your options. Even doing half of the journey by rail would have huge emissions savings and enable them to compare. I am mindful of equality and inclusion issues, such as caring responsibilities, and would reassure them that sometimes, you do have to fly, and that this is understandable.”

We estimate that Alix’s journey by rail saved 159kg of CO2 – the equivalent to heating an average home for nearly two months.

If you’d like to explore routes travelling over land rather than flying visit https://routezero.world/.

If you’re a member of staff considering how to take low impact business travel, visit the Business Travel Toolkit or contact the University of Bristol Business Travel Team.

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This blog has been written by Hannah Morgans, Sustainability Communications Project Officer and Dr Alix Dietzel, Senior Lecturer in Climate Justice in the School of Sociology, Politics and International Studies and Associate Director for Impact and Innovation at the Cabot Institute for the Environment. This blog has been reposted with kind permission from the University of Bristol’s Sustainability Team. View the original blog.

How glacier algae are challenging the way we think about evolution

Posted on June 19, 2024 by amanda.woodman-hardy

People often underestimate tiny beings. But microscopic algal cells not only evolved to thrive in one of the most extreme habitats on Earth – glaciers – but are also shaping them.

With a team of scientists from the UK and Canada, we traced the evolution of purple algae back hundreds of millions of years and our findings challenge a key idea about how evolution works. Though small, these algae are having a dramatic effect on the glaciers they live on.

Glaciers are among the planet’s fastest changing ecosystems. During the summer melt season as liquid water forms on glaciers, blooms of purple algae darken the surface of the ice, accelerating the rate of melt. This fascinating adaptation to glaciers requires microscopic algae to control their growth and photosynthesis. This must be balanced with tolerance of extreme ice melt, temperature and light exposure.

Our study, published in New Phytologist, reveals how and when their adaptations to live in these extreme environments first evolved. We sequenced and analysed genome data of the glacier algae Ancylonema nordenskiöldii. Our results show that the purple colour of glacier algae, which acts like a sunscreen, was generated by new genes involved in pigment production.

This pigment, purpurogallin, protects algal cells from damage of ultraviolet (UV) and visible light. It is also linked with tolerance of low temperatures and desiccation, characteristic features of glacial environments. Our genetic analysis suggests that the evolution of this purple pigment was probably vital for several adaptations in glacier algae.

We also identified new genes that helped increase the algae’s tolerance to UV and visible light, important adaptations for living in a bright, exposed environment. Interestingly these were linked to increased light perception as well as improved mechanisms of repair to sun damage. This work reveals how algae are adapted to live on glaciers in the present day.

Next, we wanted to understand when this adaptation evolved in Earth’s deep history.

The evolution of glacier algae

Earth has experienced many fluctuations of colder and warmer climates. Across thousands and sometimes millions of years, global climates have changed slowly between glacial (cold) to interglacial (warm) periods.

One of the most dramatic cold periods was the Cryogenian, dating back to 720-635 million years ago, when Earth was almost entirely covered in snow and ice. So widespread were these glaciations, they are sometimes referred to by scientists as “Snowball Earth”.

Scientists think that these conditions would have been similar to the glaciers and ice sheets we see on Earth today. So we wondered could this period be the force driving the evolution of glacier algae?

After analysing genetic data and fossilised algae, we estimated that glacier algae evolved around 520-455 million years ago. This suggests that the evolution of glacier algae was not linked to the Snowball Earth environments of the Cryogenian.

As the origin of glacier algae is later than the Cryogenian, a more recent glacial period must have been the driver of glacial adaptations in algae. Scientists think there has continuously been glacial environments on Earth up to 60 million years ago.

We did, however, identify that the common ancestor of glacier algae and land plants evolved around the Cryogenian.

In February 2024, our previous analysis demonstrated that this ancient algae was multicellular. The group containing glacier algae lost the ability to create complex multicellular forms, possibly in response to the extreme environmental pressures of the Cryogenian.

Rather than becoming more complex, we have demonstrated that these algae became simple and persevered to the present day. This is an example of evolution by reducing complexity. It also contradicts the well-established “march of progress” hypothesis, the idea that organisms evolve into increasingly complex versions of their ancestors.

Our work showed that this loss of multicellularity was accompanied by a huge loss of genetic diversity. These lost genes were mainly linked to multicellular development. This is a signature of the evolution of their simple morphology from a more complex ancestor.

Over the last 700 million years, these algae have survived by being tiny, insulated from cold and protected from the Sun. These adaptations prepared them for life on glaciers in the present day.

So specialised is this adaptation, that only a handful of algae have evolved to live on glaciers. This is in contrast to the hundreds of algal species living on snow. Despite this, glacier algae have dramatic effects across vast ice fields when liquid water forms on glacier surfaces. In 2016, on the Greenland ice sheet, algal growth led to an additional 4,400–6,000 million tonnes of runoff.

Understanding these algae helps us appreciate their role in shaping fragile ecosystems.

Our study gives insight into the evolutionary journey of glacier algae from the deep past to the present. As we face a changing climate, understanding these microscopic organisms is key to predicting the future of Earth’s icy environments.

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This blog is written by Dr Alexander Bowles, Postdoctoral research associate, University of Bristol

This article is republished from The Conversation under a Creative Commons license. Read the original article.

The last ozone-layer damaging chemicals to be phased out are finally falling in the atmosphere

Posted on June 18, 2024 by amanda.woodman-hardy

The high-altitude AGAGE Jungfraujoch station in Switzerland is used to take measurements of Earth’s atmosphere.
Jungfrau.ch

Since the discovery of the ozone layer, countries have agreed and amended treaties to aid its recovery. The most notable of these is the Montreal protocol on substances that deplete the ozone layer, which is widely regarded as the most successful environmental agreement ever devised.

Ratified by every UN member state and first adopted in 1987, the Montreal protocol aimed to reduce the release of ozone-depleting substances into the atmosphere. The most well known of these are chlorofluorocarbons (CFCs).

Starting in 1989, the protocol phased out the global production of CFCs by 2010 and prohibited their use in equipment like refrigerators, air-conditioners and insulating foam. This gradual phase-out allowed countries with less established economies time to transition to alternatives and provided funding to help them comply with the protocol’s regulations.

Today, refrigerators and aerosol cans contain gases like propane which, although flammable, does not deplete ozone in Earth’s upper atmosphere when released. However, ozone-friendly alternatives to CFCs in some products, such as certain foams used to insulate fridges, buildings and air-conditioning units, took longer to find. Another set of gases, hydrochlorofluorocarbons (HCFCs), was used as a temporary replacement.

A collection of used refrigerators. — HCFCs can leak to the atmosphere from discarded fridges.
RichardJohnson/Shutterstock

Unfortunately, HCFCs still destroy ozone. The good news is that levels of HCFCs in the atmosphere are now falling and indeed have been since 2021 according to research I led with colleagues. This marks a major milestone in the recovery of Earth’s ozone layer – and offers a rare success story in humanity’s efforts to tackle climate-warming gases too.

HCFCs v CFCs

HCFCs and CFCs have much in common. These similarities are what made the former suitable alternatives.

HCFCs contain chlorine, the chemical element in CFCs that causes these compounds to destroy the ozone layer. HCFCs deplete ozone to a much smaller extent than the CFCs they have replaced – you would have to release around ten times as much HCFC to have a comparable impact on the ozone layer.

But both CFCs and HCFCs are potent greenhouse gases. The most commonly used HCFC, HCFC-22, has a global warming potential of 1,910 times that of carbon dioxide, but only lasts for around 12 years in the atmosphere compared with several centuries for CO₂.

As non-ozone depleting alternatives to HCFCs became available it was decided that amendments to the Montreal protocol were needed to phase HCFCs out. These were agreed in Copenhagen and Beijing in 1992 and 1999 respectively.

This phase-out is still underway. A global target to end most production of HCFCs is set for 2030, with only very minor amounts allowed until 2040.

Turning the corner on a bumpy road

Our findings show that levels of HCFCs in the atmosphere have been falling since 2021 – the first decline since scientists started taking measurements in the late 1970s. This milestone shows the enormous success of the Montreal protocol in not only tackling the original problem of CFCs but also its lesser known and less destructive successor.

Two graphs side by side showing a the climate warming and ozone-destroying influence of HCFCs declining from 2021. — The influence of HCFCs on the atmosphere is set to fall steadily.
Western et al. (2024)/Nature

This is very good news for the ozone layer’s continuing recovery. The most recent scientific prediction, made in 2022, anticipated that HCFC levels would not start falling until 2026.

Despite HCFC levels in the atmosphere going in the right direction, not everything has been smooth sailing in the phase-out of ozone-depleting substances. In 2019 a team of scientists, including myself, provided evidence that CFC-11, a common constituent of foam insulation, was still being used in parts of China despite the global ban on production.

The United Nations Environment Programme also reported that HCFCs were illegally produced in 2020 contrary to the phase-down schedule.

In 2023, I and others showed that levels of five more CFCs were increasing in the atmosphere. Rather than illegal production, this increase was more likely the result of a different process: a loophole in the Montreal protocol which allowed CFCs to be produced if they are used to make other substances, such as plastics or non-ozone depleting alternatives to CFCs and HCFCs.

Some HCFCs at very low levels in the atmosphere have also been shown to be increasing or not falling fast enough, despite few or no known uses.

Most of the CFCs and HCFCs still increasing in the atmosphere are released in the production of fluoropolymers – perhaps best known for their application in non-stick frying pans – or hydrofluorocarbons (HFCs).

HFCs are the ozone-friendly alternative that was developed and commercialised in the early 1990s to replace HCFCs, but their role as a potent greenhouse gas means that they are subject to international climate emission reduction treaties such as the Paris agreement and the Kigali amendment to the Montreal protocol.

The next best alternative to climate-warming HFCs is a matter of ongoing discussion. In many applications, it was thought that HFCs would be replaced by hydrofluoroolefins (HFOs), but these have created their own environmental problems in the formation of trifluoroacetic acid which does not break down in the environment and, like other poly- and per-fluorinated substances (PFAS), may pose a risk to human health.

A column of air-conditioning units attached to the exterior of a building. — HFOs enable air-conditioners to use less electricity than competing alternatives.
AndriiKoval/Shutterstock

HFOs are at least more energy-efficient refrigerants than older alternatives like propane, however.

Hope for the future

In discovering this fall in atmospheric levels of HCFCs, I feel like we may be turning the final corner in the global effort to repair the ozone layer. There is still a long way to go before it is back to its original state, but there are now good reasons to be optimistic.

Climate and optimism are two words rarely seen together. But we now know that a small group of potent greenhouse gases called HCFCs have been contributing less and less to climate change since 2021 – and look to set to continue this trend for the foreseeable future.

With policies already in place to phase down HFCs, there is hope that environmental agreements and international cooperation can work in combating climate change.

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This blog is written by Cabot Institute for the Environment member Dr Luke Western, Research Associate in Atmospheric Science, University of Bristol. This article is republished from The Conversation under a Creative Commons license. Read the original article.