Stockholm+50: No way to have a conversation about climate change

 

I’m just back from Stockholm+50, the summit convened to mark 50 years since the first UN conference on ‘the human environment’ that led to the founding of the UN Environment Programme. Could the participants then have imagined that half a century later we would be living through mass extinctions and still be trying to work out how to stop (some) humans creating a hothouse world?  

Perhaps they would, if they’d seen what these conferences have become. While ‘jaw jaw’ remains better than ‘war war’, there is no doubt that these climate conferences have become a parody performance of international negotiations. Children sang and presented flowers; the UN Secretary General Antonio Gutierrez restated the ‘code red’ call he’s been making for a while now; John Kerry stated publicly that world leaders were on a ‘collective suicide mission’, which, given that he’s the United States Ambassador on Climate Change, should have made more headlines, but was instead greeted with a collective ‘meh’. ‘Interactive’ dialogue sessions promised to open up the agenda, but invited only pre-selected agencies all of whom said, again, what they’d been saying for years.  

 

This is no way to have a conversation.

 

Over two days, ministers and civil servants from every UN country and associated organisations make five minute speeches on the main stage designed to appeal to the media back home rather than make any breakthroughs in the room. There are the usual obligatory selfie walls and hordes of professional sustainability experts in suits taking advantage of them to burnish their green international network credentials. Civil society groups have to fight discriminatory visa systems and lack of funds to even get to the summit, only to find out that there is no access to the processes by which the summit decisions and texts are being made. The youth delegations express their now familiar (and understandable) frustration with the older generation and demand of tired, under-funded UN representatives that they ‘use their privilege’ and power to make the changes needed. It resembles nothing so much as a pyramid selling scheme, with everyone fighting to get closer and closer to a centre of power which, in the end, turns out to be illusory.  

 

As an outsider, watching this process in Stockholm, just as I watched COP last year in Glasgow, was like watching an old world dying. You could see old institutions struggle and fail to deal with state capture by fossil fuel interests, observe exponential natural changes meet incremental policy negotiations, feel the chaotic speed of ecosystem transformations meet lock-in and predatory delay of social systems.  

 

And yet, where there is death there is also, always, life.  

 

All around the official event were people using the summit as an excuse to gather, as a way of using the old systems to create something new. A new generation of policy actors, youth movements, academics, unions and civil society, energised by lessons learned from COP26, gathered in informal associated events and activities. This is where the energy was, where dialogue was taking place, where people were learning from each other and naming the obstacles that needed to be overcome.  

 

You could feel the energy in the work of the Fossil Fuel Non Proliferation Treaty movement which is creating serious alliances across countries and interests and is beginning to exert enough pressure to get commitments to fossil fuel phase-out on the formal agenda; you could see it in the brilliant legal escapades of the ‘Stop Ecocide’ movement making the case for the rights of nature and getting faith leaders around the world signed up to protecting nature. And more than energy, you could see serious, feasible new ideas emerging in the hard economic thinking mobilised by the Stockholm Resilience Centre in their new Earth4all report, which outlines concrete steps towards non-ecocidal and non-suicidal economic arrangements; and in the principled and practical work of the Rainforest Coalition demonstrating what real carbon capture actually looks like and tracing routes towards sustaining it.

 

What characterises many of these activities is a commitment to a different sort of conversation – to processes of unlearning, of listening, of deep attention to others in the room, of naming the hard problems and working together on them. They point the way to a new sort of conversation – one from which the organisers of future UN conferences might learn. And one which we can all begin to model and practice in each country, network or community that we are part of back home.  

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This blog is written by Cabot Institute for the Environment member Keri Facer, Professor of Social and Educational Futures at the University of Bristol.

 

Hydrological hazards across timescales

University of Bristol – Met Office Academic Partnership Meeting 

From droughts and floods to water quality and water resource management, researchers at the University of Bristol and the Met Office are world-leaders in climate and hydrological research. Building on the new academic partnership between Bristol and the Met Office, the goal of this meeting was to foster new collaborations and strengthen existing partnerships between Bristol and the Met Office on the topic of weather, climate and hydrology. 

In total, we had 29 attendees attend the workshop, with 10 from the Met Office, 17 from the University of Bristol and 2 from Fathom including weather and climate scientists, catchment hydrologists and flood modellers at a wide range of career stages. 

 

The meeting explored two key themes, the first half of the meeting focused on ‘Exploiting convection permitting weather and climate models for flood and drought prediction’, while the second half focused on ‘Quantifying uncertainty in hydrological projections’. For each theme, there were two short plenary talks that highlighted existing research across the Met Office and University of Bristol and then a presentation focused on an exciting piece of research covering topics on exploiting convection permitting models for flood and drought prediction (Lizzie Kendon) and towards large ensembles of km-scale precipitation simulations using AI (Peter Watson and Henry Addison).  We also had eight lighting talks on topics ranging from tropical cyclones to pan-tropics convection-permitting climate simulations to compound wind and flood risk.  

 

Alongside the talks, there was time for attendees to discuss ideas and opportunities focused around five key discussion topics; uncertainty estimation, compound events and multi-hazard coupling, evaluation of weather and climate driving information for hydrology, exploiting higher resolution capabilities for hydrology and from hydrological predictions to ‘services’. 

 

Overall, the meeting was a success and we appreciated an in person meeting fuelled by coffee, cake and cheese! Tangible outputs from the day included contributions on a NERC proposal, making new connections, ideas for future collaborations, sharing of data and methodologies and the foundations for a collaborative climate and hydrology community 

 

Further details from the meeting can be requested from Gemma Coxon (gemma.coxon@bristol.ac.uk). 

Mock COP26: Convincing, Cooperating and Collaborating

 

Glasgow COP26 presentation, preliminary discussion, and negotiation rounds 1 & 2

On 11th November at 10am around 60 A-level students from schools across Bristol gathered to participate in this year’s Mock COP26, hosted by Jack Nicholls, Emilia Melville, and Camille Straatman from the Cabot Institute for the Environment. After a resounding success from the first Mock COP, which took place online in March 2021, there was real excitement and anticipation building for the in-person event which would be held in the Great Hall of the Wills Memorial Building.

The morning kicked off with an engaging presentation by Jack, Emilia, and Camille, outlining the objectives of the upcoming COP26 in Glasgow. There had been much discussion surrounding the COP in the public sphere in the prior weeks, so it was interesting to see a summary of where things stand in the time since the Paris Agreement and what the potential outcomes of this COP may be.

The negotiations began with preliminary intra-group discussions, facilitated by a group of 12 postgraduate students. Each group defined their stance on each of the COP resolutions, ranging from option A, the most radical response, to C, the most conservative. It was evident from the off that these students were highly knowledgeable and passionate about the environmental, sociological, and economic impacts of each resolution, and as a result, each group wasted no time in prioritising the resolutions that would benefit their actor the most. Brazil factored in its current economic and development situation, as well as the Amazon’s critical role in the ecosystem balance, choosing to prioritise climate finance, natural protection and conservation and protecting climate refugees. For the International Indigenous Peoples Forum on Climate Change (IIFPCC), giving protected status to 50% of Earth’s natural areas by 2050 was defined as the most important resolution, whereas Shell chose to focus on phasing out coal, with the understanding that this would take the onus off the oil industry. Each group presented their ideal resolutions in a clear and concise manner.

The atmosphere really started to build in the hall when the first round of negotiations began. China faced Greenpeace in a heated discussion on coal usage while the IIFPCC negotiated with the USA on protecting indigenous populations. The United Nations High Commissioner for Refugees found alignment with Brazil on many of the resolutions, namely achieving net-zero emissions by 2050, natural protection and conservation to 30% of Earth’s natural areas and protecting climate refugees. In round two of negotiations, we saw Shell and the International Monetary Fund categorically disagree on the timeline for transition to Zero Emissions Vehicles, eventually compromising on a B resolution to have all new vehicle sales as zero-emission by 2040. Brazil was happy in supporting the IIPFCC in resolution 7a. (All countries must allow people fleeing from natural disasters, environmental degradation, and sea level rise to enter their countries and make their new homes there). Brazil and IIPFCC made an alliance to encourage USA toward resolution 7a, instead of their preferred 7b (Countries at risk of extinction from sea level rise should be provided with new land to settle and move their people to OR be provided with financial help to buy land in other nations). China and the Alliance of Small Island States (AOSIS) clash on coal usage, with AOSIS pushing back with a suggestion of image control, but ultimately China held strong on their decision.

Negotiation rounds 3 & 4, voting, and deputy mayor’s speech

The UK showed their tactical abilities and their knowledge in the negotiations with Greenpeace, but Greenpeace did not cede to their demands and manage to agree to a deal.  The IIPFCC was determined to protect indigenous land and communities, but their quest was heavily challenged by Shell. There was no common ground in the negotiation with this petrol giant, so the IIPFCC had to ensure an allyship with Brazil if they wanted to ensure the protection of the indigenous. On round four, Shell tried to sway some votes from China and Sweden, but while agreements were found with the former, the latter country was not going to let Shell influence their values. The tête-à-tête became lively as neither Shell nor Sweden were willing to compromise, resulting in a rather unsuccessful attempt of finding complicity.

After four intense rounds of negotiating, the voting began. Were all parties going to remain faithful to the agreements established during the negotiations? Or would some throw a curve ball, changing their minds at the last minute? The pondered tactics of the IIPFCC were successful, as they managed to lock Brazil’s and the USA’s support on their most valued resolutions. All parties pondered thoroughly on how to best use their votes, and it seemed that this meant that some agreements had been silently retracted, when some astonished reactions followed the raise of hands here and there.

The conference was finally over and many parties, including Brazil and Greenpeace, could celebrate the victory of the resolutions agreed upon. Yet, it was clear that a bittersweet aftertaste was left in the mouths of some parties, who did not manage to persuade enough. The heated debate had ended, and what was done was done, but one more surprise was awaiting our participants. Deputy Mayor Asher Craig had been sitting on the sidelines for a few instances already, assisting in the final yet most heated rounds of the conference. She was there, observing our pupils in awe as they got into character and avidly fought for their beliefs. The Deputy Mayor was impressed by the passion of these young minds and how much they are invested in the cause; she was proud to see that young generations care about the environment and our planet, as they came up with ideas for change that they would like to see more in the Bristol. The innovativeness and creativity of the students was remarkable in her eyes, as she proceeded to give an inspiring and uplifting speech on the efforts currently being made by the City Council to respond to the climate emergency. The mock COP26 was a more than a successful event, and as everyone waited for the results of the conference in Glasgow, we all wished that our simulation had been real.

Watch the students in action in this short video created by Particle Productions and funded by Bristol City Council.

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This blog is written by Sonia Pighini and Jennifer Malone, who are students on the Cabot Institute for the Environment Master’s by Research.

Jennifer Malone
Currently studying for a Master’s by Research in Global  Environmental Challenges from the Cabot Institute for the Environment, Jennifer’s research is centred on food system decarbonisation within the scope of UK food policy and community practice.
Sonia Pigini

Sonia is an international student in the MscR programme Global Environmental Challenges. Their research focuses on people-centred sustainable food system transitions in Bristol. They are particularly interested in exploring the potential for a more decentralised food system in the city, which empowers local producers, engages consumers and that keeps aspects such as justice and inclusion at its heart.

Image credit (image at top of blog): Jack Pitts

India heatwave: why the region should prepare for even more extreme heat in the near future

An extreme heatwave in India and Pakistan has left more than a billion people in one of the most densely populated parts of the world facing temperatures well above 40℃. Although this has not broken all-time records for the regions, the hottest part of the year is yet to come.

Though the heatwave is already testing people’s ability to survive, and has led to crop failures and power blackouts, the really scary thing is that it could be worse: based on what has happened elsewhere at some point India is “due” an even more intense heatwave.

Together with a few other climate scientists, we recently looked for the most extreme heatwaves globally over the past 60 years – based on the greatest difference from expected temperature variability in that area, rather than by maximum heat alone. India and Pakistan do not feature in our results, now published in the journal Science Advances. Despite regularly having extremely high temperatures and levels of heat stress in absolute terms, when defined in terms of deviation from the local normal, heatwaves in India and Pakistan to date have not been all that extreme.

In fact, we highlighted India as a region with a particularly low greatest historical extreme. In the data we assessed, we didn’t find any heatwaves in India or Pakistan outside three standard deviations from the mean, when statistically such an event would be expected once every 30 or so years. The most severe heatwave we identified, in southeast Asia in 1998, was five standard deviations from the mean. An equivalent outlier heatwave in India today would mean temperatures of over 50℃ across large swaths of the country – such temperatures have only been seen at localised points so far.

Our work therefore suggests India may experience even more extreme heat. Assuming the statistical distribution of daily maximum temperatures is broadly the same across the world, statistically a record-breaking heatwave is likely to occur in India at some point. The region has not yet had reason to adapt to such temperatures, so may be particularly vulnerable.

Harvests and health

Although the current heatwave has not broken any all-time records, it is still exceptional. Many parts of India have experienced their hottest April on record. Such heat this early in the year will have devastating impacts on crops in a region where many rely on the wheat harvest both to eat and to earn a living. Usually, extreme heat in this area is closely followed by cooling monsoons – but these are still months away.

It is not just crop harvests that will bear the brunt, as heatwaves affect infrastructure, ecosystems and human health. The impacts on human health are complex as both meteorological factors (how hot and humid it is) and socioeconomic factors (how people live and how they are able to adapt) come into play. We do know that heat stress can lead to long-term health issues such as cardiovascular diseases, kidney failure, respiratory distress and liver failure, though we will be unable to know exactly how many people will die in this heatwave due to the lack of necessary health data from India and Pakistan.

What the future holds

To consider the impact of extreme heat over the next few decades, we have to look at both climate change and population growth, since it is a combination of the two that will amplify the human-health impacts of heat extremes in the Indian subcontinent.

world map with some countries shaded yellow
Hotspots of population increases over the next 50 years (red circles), all coincide with locations where no daily mortality data exists (yellow).
Mitchell, Nature Climate Change (2021), CC BY-SA

In our new study, we investigated how extremes are projected to increase in the future. We used a large ensemble of climate model simulations, which gave us many times more data than is available for the real world. We found that the statistical distribution of extremes, relative to a shift in the underlying climate as it generally gets warmer, does not change. In the climate models the daily temperature extremes increase at the same rate as the shift in the mean climate. The IPCC’s latest report stated that heat waves will become more intense and more frequent in south Asia this century. Our results support this.

The current heatwave is affecting over 1.5 billion people and over the next 50 years the population of the Indian subcontinent is projected to increase by a further 30%. That means hundreds of millions more people will be born into a region that is likely to experience more frequent and more severe heatwaves. With even larger numbers of people being affected by even greater heat extremes in the future, measures to adapt to climate change must be accelerated – urgently.The Conversation

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This blog is written by Cabot Institute for the Environment members Dr Vikki Thompson, Senior Research Associate in Geographical Sciences, University of Bristol and Dr Alan Thomas Kennedy-Asser, Research Associate in Climate Science, University of Bristol.

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

Climate Change 2022: Impacts, Adaptations and Vulnerability – an IPCC lead author report summary

Professor Daniela Schmidt, a lead author of the recently published IPCC (Intergovernmental Panel on Climate Change)  report, Working Group II: Impacts, Adaptations and Vulnerability, recently gave an internal presentation to University of Bristol staff to summarise the report’s findings.

Recent geo-political events have meant that this report has understandably been overlooked in comparison to its predecessor, however, at 3500 pages and being the product of analysis of 34,000 papers since 2014, it is certainly not light reading. This writing aims to pinpoint and amplify the key messages from Daniela’s summary of Working Group II: Impacts, Adaptations and Vulnerability, as the Working Group III: Mitigation of Climate Change report has been released this week.

Solutions

The key take home message, was that the report offers solutions, but they are needed now. Daniela explained that it is not all doom and gloom, and it is important for our survival not to take it that way. From the report itself, the key quote, which you have perhaps seen shared elsewhere, is

The science is clear. Any further delay in concerted global action will miss a brief and rapidly closing window to secure a livable future. This report offers solutions to the world.

Nature

One of the key solutions proposed in the report is nature, both in terms of its conservation and restoration and that it offers promising solutions to many of the threats we face. For example, the potential of natural carbon sinks, coastal protection, water management and urban cooling systems has been repeatedly evidenced, as well as the importance of integrating nature and natural solutions into urban spaces.

The report stresses that humans are part of ecosystems, not separate from them, and nature is crucial to our survival because of the essential and irreplaceable ecosystem services it provides. Fragmented, polluted and overexploited ecosystems are much more vulnerable to climate change, therefore, the report stresses it is therefore important to take a coordinated approach, with their protection and restoration in mind.

Interconnection

As well as the interconnectedness of humans and nature, the report evidences previously unrealised interconnections of climate risks. Risks are becoming more complex and there are compound and cascading risks through systems. For example, in terms of food scarcity, we need to consider that heat stress will not only reduce crop yields, but also the well-being and productivity of farm workers, further exacerbating the situation. There is an increased recognition of the interconnections between people, regions, society, ecosystems, biodiversity. This means that climate change cannot be seen as an individual problem, but as one intrinsically linked with natural resource depletion, ecosystem destruction, and growing urbanisation and inequity across the world.

Equality

Another key focus of the report was the importance of but lack of global equality, which will continue to be exacerbated in the face of climate change. 3.3  – 3.6 billion live in hotspots of high vulnerability to climate change, due to high levels of poverty, limited access to water, sanitation and health services, climate sensitive livelihoods and lack of funding and accountability in government. I would like to point out, that in the vast majority of cases, it is these communities whose carbon contributions are the least, which in my opinion strongly evidences to the fact that climate change is a political problem as well as a scientific one.

Due to inequality being a big problem, the report places an emphasis on the importance of promoting equality in the solutions and with this the need to listen to marginalised voices. Daniela explained that of global climate funding, 80% goes to mitigation, or reduction of emissions, while only 20% goes to adaptation, which is likely to be what is most consequential to more vulnerable communities.

After lack of action on deals made at COP26, which scientists have already argued at best would not be sufficient to solve the problem, a continued lack of action following these urgent messages will be deeply concerning for the fate of the planet, and especially for its most vulnerable communities.

Watch Daniela’s presentation to University of Bristol staff.

 

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This blog is written by Cabot Institute for the Environment member Hilary McCarthy, University of Bristol.
Hilary McCarthy

 

Tyre Extinguishers: activists are deflating SUV tyres in the latest pop-up climate movement

JARUEK_CH/Shutterstock

A new direct action group calling itself the Tyre Extinguishers recently sabotaged hundreds of sports utility vehicles (SUVs) in various wealthy parts of London and other British cities. Under cover of darkness, activists unscrewed the valve caps on tyres, placed a bean or other pulse on the valve and then returned the cap. The tyres gently deflated.

Why activists are targeting SUVs now can tell us as much about the failures of climate policy in the UK and elsewhere as it can about the shape of environmental protest in the wake of Extinction Rebellion and Insulate Britain.

The “mung bean trick” for deflating tyres is tried and tested. In July 2008, the Oxford Mail reported that up to 32 SUVs were sabotaged in a similar way during nocturnal actions in three areas of the city, with anonymous notes left on the cars’ windscreens.

In Paris in 2005, activists used bicycle pumps to deflate tyres, again at night, again in affluent neighbourhoods, again leaving anonymous notes. In both cases, activists were careful to avoid causing physical damage. Now it’s the Tyre Extinguishers who are deflating SUV tyres.

In the early 2000s, SUVs were still a relative rarity. But by the end of 2010s, almost half of all cars sold each year in the US and one-third of the cars sold in Europe were SUVs.

In 2019, the International Energy Agency reported that rising SUV sales were the second-largest contributor to the increase in global CO₂ emissions between 2010 and 2018 after the power sector. If SUV drivers were a nation, they would rank seventh in the world for carbon emissions.

At the same time, the Tyre Extinguishers’ DIY model of activism has never been easier to propagate. “Want to get involved? It’s simple – grab some leaflets, grab some lentils and off you go! Instructions on our website,” chirps the group’s Twitter feed.

Changing activist strategy

Though the actions led by the Tyre Extinguishers have numerous precedents, the group’s recent appearance in the UK’s climate movement does mark a change of strategy.

Extinction Rebellion (XR), beginning in 2018, hoped to create an expanding wave of mobilisations to force governments to introduce new processes for democratically deciding the course of climate action. XR attempted to circumvent existing protest networks, with its message (at least initially) aimed at those who did not consider themselves activists.

In contrast, activists in the Tyre Extinguishers have more in common with groups that have appeared after XR, such as Insulate Britain, whose members blockaded motorways in autumn 2021 to demand government action on the country’s energy inefficient housing. These are what we might call pop-up groups, designed to draw short-term media attention to specific issues, rather than develop broad-based, long-lasting campaigns.

After a winter of planning, climate activists are likely to continue grabbing headlines throughout spring 2022. XR, along with its sister group, Just Stop Oil, threaten disruption to UK oil refineries, fuel depots and petrol stations. Their demands are for the government to stop all new investments in fossil fuel extraction.

An industrial scene with three cooling towers and various chimneys lit up with yellow lights.
UK-based activists have threatened to block oil refineries in April 2022.
Orxy/Shutterstock

The Tyre Extinguishers explicitly targeted a specific class of what they consider anti-social individuals. Nevertheless, that the group’s action is covert and (so far at least) sporadic is itself telling.

In his book How to Blow up a Pipeline, Lund University professor of human ecology Andreas Malm asked at what point climate activists will stop fetishising absolute non-violence and start campaigns of sabotage. Perhaps more important is the question that Malm doesn’t ask: at what point will the climate movement be strong enough to be able to carry out such a campaign, should it choose to do so?

Given the mode of action of the Tyre Extinguishers, the answer on both counts is: almost certainly not yet.

The moral economy of SUVs

For now, the Tyre Extinguishers will doubtless be sustained by red meat headlines in the right-wing press. It’s still probable, however, that the group will deflate almost as quickly as it popped up: this is, after all, what has happened with similar groups in the past.

The fact that activists are once again employing these methods speaks to the failure of climate policy. Relatively simple, technical measures taken in the early 2000s would have solved the problem of polluting SUVs before it became an issue. The introduction of more stringent vehicle emissions regulations, congestion charging, or size and weight limits, would have stopped the SUV market in its tracks.

SUVs are important because they are so much more than metal boxes. Matthew Paterson, professor of international politics at the University of Manchester, argues that the connection between freedom and driving a car has long been an ideological component of capitalism.

And Matthew Huber, professor of geography at Syracuse University in the US, reminds readers in his book Lifeblood that oil is not just an energy source. It generates ways of being which become culturally and politically embedded, encouraging individualism and materialism.

Making SUVs a focal point of climate activism advances the argument that material inequality and unfettered individual freedoms are incompatible with any serious attempt to address climate change.

And here lies the crux of the conflict. The freedom of those who can afford to drive what, where and when they want infringes on the freedoms of the majority to safely use public space, enjoy clean air, and live on a sustainable planet.

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This blog is by Graeme Hayes, Reader in Political Sociology, Aston University and Cabot Institute for the Environment member Dr Oscar Berglund, Lecturer in International Public and Social Policy, University of Bristol

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

Dune: how high could giant sand dunes actually grow on Arrakis?

Frank Herbert first published his science-fiction epic Dune back in 1965, though its origins lay in a chance encounter eight years previously when as a journalist he was tasked to report on a dune stabilisation programme in the US state of Oregon. Ultimately, this set the wheels in motion for the recent film adaptation.

The large and inhospitable sand dunes of the desert planet Arrakis are, of course, very prominent in both the books and film, not least because of the terrifying gigantic sandworms that hunt any movement on the surface. But just how high would sand dunes be on a realistic version of this world?

Before the movie was released, we took a scientific climate model and used it to simulate the climate of Arrakis. We now want to use insights from this same model to focus on the dunes themselves.

Sand dunes are the product of thousands or even tens of thousands of years of erosion of the underlying or surrounding geology. On a simple level, they are formed by sand being blown along the path of the prevailing wind until it meets an obstruction, at which point the sand will settle in front of it.

There is certainly no shortage of wind on Arrakis. Our simulation showed that wind would routinely exceed the minimum speed required to blow sand grains into the air, and there are even some regions where speeds regularly reach 162 km/h during the year. That’s well over hurricane force.

Diagram of sand dune formation
How sand dunes are formed. David Tarailo / US National Park Service / Geological Society of America

Sand dunes in the book are said to be on average around 100 metres high. However, this isn’t based on actual science, more likely it’s what Herbert knew from his time in Oregon as well as the world we live in. But we can use our climate model to predict what the general (and maximum) attainable height might suggest.

Where the wind blows

The size and distance between giant dunes are determined not simply by the type of sand or underlying rock, but by the lowest 2km or so of the atmosphere that interacts with the land surface. This level, also known as the planetary boundary layer, is where most of the weather we can see occurs. Above this, a thin “inversion layer” separates the weather below from the more stable higher-altitude part of the atmosphere.

The growth of sand dunes and theoretical height is determined by the depth of this boundary layer where the wind blows. Sand dunes stabilise above the wind at the altitude of the inversion layer. The height of the boundary layer – usually somewhere between 100 metres to 2,000 metres – can vary through the night as well as the year. When it is cooler, it is shallower. When there is a strong wind or lots of rising warm air, it is deeper.

Arrakis would be much hotter than Earth, which means more rising air and a boundary layer two to three times as high over land compared with ours. Our climate model simulation, therefore, predicts dunes on Arrakis would be as high as 250m, particularly in the tropics and mid-latitudes. That’s about three times the height of the Big Ben clock tower in London. Most regions would have a more modest average height of between 25m and 75m. As the boundary layer is generally higher everywhere on Arrakis the average dune height is in general twice that of Earths.

map with shaded areas
Predicted sand dune height (in metres) on Arrakis. Farnsworth et alAuthor provided

We were also able to simulate the space between dunes, which can also be determined by the height of the boundary layer. Spacing is highest in the tropics, a little over 2km between the crest of one giant sand dune to the next. However, in general, sand dunes have a spacing of around 0.5 to 1km crest to crest. Still plenty of room for a sandworm to wiggle through. Scientists looking at Saturn’s moon Titan have run this same process in reverse, using the space between dunes – easy to measure with satellite images – to estimate a boundary layer of up to 3km.

As nothing can grow on Arrakis to stabilise these sand dunes they will always be in a state of constant drift across the planet. Some large dunes on Earth can move about 5m a year. Smaller dunes can move even faster – about 20m a year.

A visualisation of the authors’ climate model of Arrakis. Source: climatearchive.org/dune.

Mountain-sized dunes?

Our simulation can only give the general height that most sand dunes would reach, and there would be exceptions to the rule. For instance, the largest known sand dune on Earth today is the Duna Federico Kirbus in Argentina, a staggering 1,234m in height. Its size shows that local factors, such as vegetation, surrounding hills or the type of local sand, can play an important role.

Given Arrakis is hotter than Earth, has a higher boundary layer and has more sand and stronger winds, it’s possible a truly mammoth dune the size of a small mountain may form somewhere – it’s just impossible for a climate model to say exactly where.

Scientists have recently revealed that as the world warms the planetary boundary layer is increasing by around 53 metres a decade. So we may well see even bigger record-breaking sand dunes as the lower atmosphere continues to warm – even if Earth will not end up like Arrakis.The Conversation

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This blog is written by Caboteers Dr Alex Farnsworth, Senior Research Associate in Meteorology, University of Bristol and Dr Sebastian Steinig, Research Associate in Paleoclimate Modelling, University of Bristol and Dr Michael Farnsworth, Research Lead Future Electrical Machines Manufacturing Hub, University of Sheffield,

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

Human health is entwined with the health of our planet

 

It’s a short time since COP26 finished in Glasgow. Many colleagues from the University of Bristol were there to discuss their research and share knowledge with those who are making decisions about policies that impact everyone’s futures. When we think about climate change, we often think about the health of the planet and the natural world, but the health of our planet is entwined to the health of the human population too. Here, Elizabeth Blackwell Institute Director, Rachael Gooberman-Hill, gives a timely update on our research looking at the intersection between climate and health.

We’re already seeing local and global impacts of climate change on human health. The World Health Organization states that in the 20 years from 2030 to 2050 climate change will cause around 250,000 additional deaths per year, which is a timeframe that starts in just eight years from now.

These, arguably preventable, deaths will relate to malnutrition, malaria, diarrhoea and heat. Health impacts of climate change will disproportionately affect people who are already vulnerable in other ways, including people who are young, old, living with other conditions, or living in situations of vulnerability including poverty and other dimensions of disadvantage. Climate change is associated with changes in infectious diseases and non-communicable conditions, such as mental health difficulties. Heat and extreme weather events have major impact on health, cause forced migration and these issues are global in scale. In the UK, extreme weather events and heat are already visible and are likely to become more common and more impactful.

Embedding climate in current research

Broadly speaking, research efforts include work to reduce rise in our planet’s temperature and attempts to address, mitigate, and adapt to the impact of the rises that are already happening. At the Elizabeth Blackwell Institute we are working with the Cabot Institute for the Environment. As researchers, we can change focus of our research, can embed climate in the research that we are already planning or doing, and we can also consider that all of the research that we do is already impacted by climate change and will already have much to add to the evidence base that can underpin change and make a difference.

Mapping activity in climate research

The University of Bristol has a world-leading track record in environment-focused research already. We recently mapped the research activity in this area and identified 39 climate and health related research projects and over 150 members of our research community working in this area. We work on many topics, including extreme weather events, heat, water and sanitation, animal health, crops and nutrition, and social impacts of climate change. The University is an active member of the Met Office Academic Partnership (MOAP), we contribute considerable and internationally recognised expertise to the Intergovernmental Panel on Climate Change (IPCC), including in the crucial assessment reports which provide the scientific evidence base. We’re active in the GW4 Climate Alliance, comprising the Universities of Bristol, Cardiff, Bath, and Exeter.

Potential to pivot

There is real potential now to build this area even more. Many members of our University are deeply concerned about climate change and many are doing work that helps, or want to do so. We are a community whose research is often driven by our sense of social responsibility and we’ve seen before how our desire to make a difference can drive new focus. In the early days of the COVID-19 pandemic we saw large parts of the University’s research community turn skills and attention to the virus and its impact. At the Elizabeth Blackwell Institute we supported over 90 projects that focused on COVID-19 and owe thanks to everyone for the vast effort that has been put into research with real world impact. The effort to focus on COVID-19 showed how our expert researchers can pivot quickly onto new topic areas, although other topics remained urgent and important alongside our pandemic-related work.

Supporting more climate research

The Elizabeth Blackwell Institute wants to support the desire and need to work on climate change and health, whether that’s to enable people to pivot to the area, build on existing work or to encompass climate change into existing workstreams. We’ve already supported projects focused on climate change and health, with particular emphasis on interdisciplinary research. We want to support even more. As we move forward from COP26, please consider how your research can address climate change and health and let us know about your plans and ideas.

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This blog is by Elizabeth Blackwell Institute Director, Rachael Gooberman-Hill . View the original post.

Rachel Gooberman-Hill

Canada’s flood havoc after summer heatwave shows how climate disasters combine to do extra damage

People living in British Columbia will feel like they have had more than their fair share of climate disasters in 2021. After a record-breaking heatwave in June, the state in western Canada has been inundated by intense rain storms in November. It’s also likely the long-lasting effects of the heatwave made the results of the recent rainfall worse, causing more landslides – which have destroyed highways and railroads – than would otherwise have happened.

In June 2021, temperature records across western North America were shattered. The town of Lytton in British Columbia registered 49.6°C, breaking the previous Canadian national record by 5°C. The unprecedented weather was caused by a high pressure system, a so-called “heat dome”, which sat over the region for several days.

Heat intensified within the dome as the high pressure compressed the air. Dry ground conditions forced temperatures even higher, as there was less water evaporating to cool things down. Although unconfirmed, it’s estimated that the heatwave caused over 400 deaths in British Columbia alone.

A helicopter flies over a burning pine forest beneath a blue sky.
Wildfires ravaged British Columbia during the hot and dry summer of 2021.
EB Adventure Photography/Shutterstock

The hot and dry weather also sparked wildfires. Just days after recording the hottest national temperature ever, the town of Lytton burned to the ground. The summer’s fires and drought left the ground charred and barren, incapable of absorbing water. These conditions make landslides more likely, as damaged tree roots can no longer hold soil in place. It also ensures water flows over the soil quicker, as it cannot soak into the baked ground.

The huge rain storm which lasted from Saturday November 13 to Monday 15 was caused by an atmospheric river – a long, narrow, band of moisture in the atmosphere stretching hundreds of miles. When this band travels over land it can generate extreme rainfall, and it did: in 48 hours, over 250mm of rain fell in the town of Hope, 100km east of Vancouver.

This much rainfall on its own would probably cause extensive flooding. But combined with the parched soil, the results have been catastrophic. Landslides have destroyed many of the region’s transport links, leaving Vancouver cut off by rail and road. But the bad news doesn’t end there; sediment washed away by these floods could make future floods this winter even worse.

British Columbia is in the grip of what scientists call a compound climate disaster. The effects of one extreme weather event, like a heatwave, amplify the effects of the next one, like a rain storm. Instead of seeing floods and wildfires as discrete events, compound disasters force us to comprehend the cascading crises which are likely to multiply as the planet warms.

How to understand compound climate disasters

The port of Vancouver is the busiest in Canada, moving US$550 million worth of cargo every day. Because rail links are damaged, ships laden with commodities sit offshore. Canada’s mining and farming industries are having to divert exports through the US. Depending on how quickly the rail links recover, significant economic impacts are possible.

Both the June heatwave and the November rainstorm are unprecedented, record-breaking events, but is their occurrence in the same year just bad luck? A rapid attribution study found that the heatwave was virtually impossible without climate change. The atmospheric river which brought the deluge is also likely to become more common and intense in a warming climate.

In British Columbia, future flooding is almost guaranteed to be more frequent and severe. This is life at 1.2°C above the pre-industrial temperature average, yet most politicians don’t seem too worried about taking the necessary action to prevent warming beyond 1.5°C – the limit which countries agreed in 2015 is a threshold beyond which catastrophic climate change becomes more likely.

Western Canada’s year of weather extremes did not come from nowhere. Past trends and future projections tell us to expect hotter summers and wetter winters in this part of the world, and record-shattering climate extremes are on the rise.

Worldwide, compound climate disasters are becoming more common as climate change accelerates. Risk assessments typically measure the impacts of one event at a time, like the damage caused by intense rain storms, without considering how the earlier drought influenced it. This leads to scientists and insurers underestimating the overall damage. With so many combinations of climate extremes – flooding following wildfires, hurricanes passing as cold spells arrive – we must prepare for every possibility.The Conversation

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This blog is written by Cabot Institute for the Environment member Dr Vikki Thompson, Senior Research Associate in Geographical Sciences, University of Bristol.

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

Vikki Thompson

Humanity is compressing millions of years of natural change into just a few centuries

The near future may be similar to the mid-Pliocene warm period a few million years ago.
Daniel Eskridge / shutterstock

Many numbers are swirling around the climate negotiations at the UN climate summit in Glasgow, COP26. These include global warming targets of 1.5℃ and 2.0℃, recent warming of 1.1℃, remaining CO₂ budget of 400 billion tonnes, or current atmospheric CO₂ of 415 parts per million.

It’s often hard to grasp the significance of these numbers. But the study of ancient climates can give us an appreciation of their scale compared to what has occurred naturally in the past. Our knowledge of ancient climate change also allows scientists to calibrate their models and therefore improve predictions of what the future may hold.

Recent climate changes in context.
IPCC AR6, chapter 2

Recent work, summarised in the latest report of the Intergovernmental Panel on Climate Change (IPCC), has allowed scientists to refine their understanding and measurement of past climate changes. These changes are recorded in rocky outcrops, sediments from the ocean floor and lakes, in polar ice sheets, and in other shorter-term archives such as tree rings and corals. As scientists discover more of these archives and get better at using them, we have become increasingly able to compare recent and future climate change with what has happened in the past, and to provide important context to the numbers involved in climate negotiations.

For instance one headline finding in the IPCC report was that global temperature (currently 1.1℃ above a pre-industrial baseline) is higher than at any time in at least the past 120,000 or so years. That’s because the last warm period between ice ages peaked about 125,000 years ago – in contrast to today, warmth at that time was driven not by CO₂, but by changes in Earth’s orbit and spin axis. Another finding regards the rate of current warming, which is faster than at any time in the past 2,000 years – and probably much longer.

But it is not only past temperature that can be reconstructed from the geological record. For instance, tiny gas bubbles trapped in Antarctic ice can record atmospheric CO₂ concentrations back to 800,000 years ago. Beyond that, scientists can turn to microscopic fossils preserved in seabed sediments. These properties (such as the types of elements that make up the fossil shells) are related to how much CO₂ was in the ocean when the fossilised organisms were alive, which itself is related to how much was in the atmosphere. As we get better at using these “proxies” for atmospheric CO₂, recent work has shown that the current atmospheric CO₂ concentration of around 415 parts per million (compared to 280 ppm prior to industrialisation in the early 1800s), is greater than at any time in at least the past 2 million years.

chart showing climate changes over history
An IPCC graphic showing climate changes at various points since 56 million years ago. Note most rows show changes over thousands or millions of years, while the top row (recent changes) is just a few decades.
IPCC AR6, chapter 2 (modified by Darrell Kaufman)

Other climate variables can also be compared to past changes. These include the greenhouse gases methane and nitrous oxide (now greater than at any time in at least 800,000 years), late summer Arctic sea ice area (smaller than at any time in at least the past 1,000 years), glacier retreat (unprecedented in at least 2,000 years) sea level (rising faster than at any point in at least 3,000 years), and ocean acidity (unusually acidic compared to the past 2 million years).

In addition, changes predicted by climate models can be compared to the past. For instance an “intermediate” amount of emissions will likely lead to global warming of between 2.3°C and 4.6°C by the year 2300, which is similar to the mid-Pliocene warm period of about 3.2 million years ago. Extremely high emissions would lead to warming of somewhere between 6.6°C and 14.1°C, which just overlaps with the warmest period since the demise of the dinosaurs – the “Paleocene-Eocene Thermal Maximum” kicked off by massive volcanic eruptions about 55 million years ago. As such, humanity is currently on the path to compressing millions of years of temperature change into just a couple of centuries.

Small animals in a forest
Many mammals, like these horse-ancestors ‘Eohippus’, first appeared after a sudden warm period 55 million years ago.
Daniel Eskridge / shutterstock

Distant past can held predict the near future

For the first time in an IPCC report, the latest report uses ancient time periods to refine projections of climate change. In previous IPCC reports, future projections have been produced simply by averaging results from all climate models, and using their spread as a measure of uncertainty. But for this new report, temperature and rainfall and sea level projections relied more heavily on those models that did the best job of simulating known climate changes.

Part of this process was based on each individual model’s “climate sensitivity” – the amount it warms when atmospheric CO₂ is doubled. The “correct” value (and uncertainty range) of sensitivity is known from a number of different lines of evidence, one of which comes from certain times in the ancient past when global temperature changes were driven by natural changes in CO₂, caused for example by volcanic eruptions or change in the amount of carbon removed from the atmosphere as rocks are eroded away. Combining estimates of ancient CO₂ and temperature therefore allows scientists to estimate the “correct” value of climate sensitivity, and so refine their future projections by relying more heavily on those models with more accurate climate sensitivities.

Overall, past climates show us that recent changes across all aspects of the Earth system are unprecedented in at least thousands of years. Unless emissions are reduced rapidly and dramatically, global warming will reach a level that has not been seen for millions of years. Let’s hope those attending COP26 are listening to messages from the past.

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This blog is written by Cabot Institute for the Environment member Dan Lunt, Professor of Climate Science, University of Bristol and Darrell Kaufman, Professor of Earth and Environmental Sciences, Northern Arizona University

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

Dan Lunt

 

 

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