Welcome to Carbon Brief’s Cropped.
We handpick and explain the most important stories at the intersection of climate, land, food and nature over the past fortnight.
Key developments
UK election impacts
LABOUR’S ENVIRONMENT PRIORITIES: The UK’s new Labour government has started to outline its priorities, with the new minister for the Department for Environment, Food and Rural Affairs (Defra), Steve Reed, setting out his five priorities in a video posted to Twitter. These were, he said: “Cleaning up British rivers, lakes and seas; creating a roadmap to move Britain to a zero-waste economy; supporting farmers to boost Britain’s food security; ensuring nature’s recovery; and protecting communities from flooding.” Edie reported that the UK “ranks in the bottom 10% of nations globally in terms of biodiversity intactness”, and that it is nowhere near its national goal of protecting 30% of its land and sea by 2030.
AGRICULTURE PLANS: However, a budget for farming was notably absent from the Labour manifesto. Nick von Westenholz, the National Farmers Union’s (NFU) director for strategy, told Euractiv last week that setting the budget for the environmental land management schemes (Elms), which will replace the EU’s multimillion farming subsidy programme by 2027, was “crucial”. Under Elms, farmers can receive subsidies for actions such as reducing pesticide use, planting wildflowers and preventing groundwater pollution. (See Carbon Brief’s 2023 explainer for more details.) Making the Elms subsidies financially attractive to farmers was a key issue, von Westenholz said: “There is a concern about the budget not being sufficient and that there won’t be enough of a business case for farmers to adopt the scheme”. Last week, Carbon Brief analysed the climate issues that the new Labour government will have to address, including those on land, agriculture and nature.
CONSERVATIONISTS REACT: Inkcap Journal summarised the positive, but cautious, reactions of conservation champions to Labour’s victory. Charities including the RSPB and CPRE urged the new prime minister to “act quickly on nature”, highlighting that upcoming decisions will “affect all UK wildlife immensely”. The Wildlife Trusts commended Labour’s “welcome commitments on nature and climate”, but published a list of priorities for the new government, including a review of the Environmental Improvement Plan and increasing the budget for wildlife-friendly farming. Experts also shared their views with Carbon Brief on what Labour’s priorities should be for climate action.
African farmers’ woes
DOUBLE THREAT: In the Conversation, University of Cape Town researcher Dr Vuyisile Moyo described the challenges facing farmers in Zimbabwe due to the “combination of heat, droughts and floods caused by climate change, and water contamination and damaged land caused by illegal, small-scale mining”. There are an estimated 400,000 illegal, small-scale miners in the country and their operations have resulted in “deforestation, land degradation, water pollution and loss of biodiversity”, Moyo wrote. One farmer told Moyo: “My farm was encroached by the artisanal miners who believed that there is a lot of gold there. My farmland was dug all over and now I no longer have land for crop production.”
MALNUTRITION AND DROUGHT: Al Jazeera carried a gallery of photos from drought-stricken Zimbabwe, with one farmer telling the outlet: “I did not harvest anything after all my effort and using all our savings to buy seeds.” Malnutrition is on the rise in the eastern Zimbabwean district of Mudzi, with cases jumping “by about 20%” over the past three months. The outlet added that “Zimbabwe and neighbouring Malawi and Zambia are among the countries in southern Africa most affected by malnutrition” amid the drought. In nearby Namibia, cattle sales have increased by nearly 50% as farmers facing the “biting effects of drought” have been forced to sell off their herds, the Namibian reported. As a result of the influx of cattle to the market, producers’ prices declined by nearly 4% since last year, the outlet added.
‘FOOD SECURITY CRISIS’: In South Africa’s Western Cape province, “informal settlements have been waterlogged for days” following heavy rains, Ground Up reported. Many of the people living in these settlements are “farm workers who have been evicted from farms they used to live at”, the South African outlet wrote. The Associated Press reported that “a food security crisis lies ahead” for Kenya following devastating floods that impacted the country beginning in mid-March. And local NGOs told Devex that flooding across east Africa has left children at risk of malnutrition “because of lack of food and medical services”.
Spotlight
Murky waters
In this spotlight, Carbon Brief unpacks the agenda ahead of the International Seabed Authority, as it resumes negotiations to frame rules for deep-sea mining.
The controversial possibility of mining the deep sea for critical minerals has been catapulted to the spotlight in the past few years, from investigations into the work of the International Seabed Authority (ISA) to late-night comedians in the US running dedicated segments.
Triggered by a move by Nauru in 2021, the ISA has been “under pressure” to finalise rules to regulate deep-sea mineral exploitation or risk the possibility of assessing mining applications without them.
That “what-if” scenario has become one of “what-now”, as the ISA’s 36-member council has already passed the July 2023 deadline to draw up this mining code. This atmosphere of uncertainty has since been met by a growing chorus of 27 governments that have called for some form of ban, moratorium or pause on deep-sea mining.
On Tuesday, the ISA resumed its 29th annual session in Kingston, Jamaica, with three crucial points on the agenda for its council and assembly: the debate over the mining code and a moratorium, the election of its secretary general and, for the first time ever, a discussion on the need for a general policy to protect and preserve the marine environment.
“All states have said that they don’t want [mineral] exploitation without regulation, but just how robust that regulation is, that’s the fault line,” Julian Jackson, project director of seabed mining at Pew Charitable Trusts, told Carbon Brief. According to Jackson, there are still “30 outstanding, big policy issues” to be resolved, from “permissible levels of environmental harm” – such as thresholds for toxicity – to issues of compensation and liability. He added:
“These are very technical negotiations, with yet more detailed standards and guidelines remaining to be addressed, all being done in an international, multilateral setting with very divergent views and not enough time.”
While the groundswell calling for a moratorium has grown, with banks and companies joining the fray, senior lecturer at the Borneo Marine Institute Dr Sharifah Nora Syed Ibrahim points to the fact that developed countries such as Norway have moved in the opposite direction. She told Carbon Brief:
“Norway wants to keep the option of deep-sea mining open, including within its national waters, because if oil is being phased out due to the climate movement, what other main natural resources does Norway have, other than fisheries?”
Who secures the ISA’s top post, which holds sway over the deep sea’s future, has been the subject of a huge scandal in recent weeks. Earlier this month, a New York Times investigation pointed to “allegations of possible payments to help secure votes” and attempts “to entice a candidate to withdraw from a race” amid complaints of misuse of agency funds by ISA chief Michael Lodge, who is currently eyeing a third term at the top.
While Lodge responded to the Times in a six-page statement describing the story as a “collation of vague, unsubstantiated, unfounded and anonymous rumours”, observers told Carbon Brief the allegations were being discussed on the first day of the talks.
“The science [on impacts] is way behind, the regulations are also way behind,” said Jackson:
“In the meanwhile, how do you have a multilateral organisation mired in allegations of conflicts of interest governing what is still so poorly understood?”
News and views
ARGENTINA BEEF: The consumption of beef in Argentina has fallen to a historical low, with demand forecasted to fall to the “lowest level in a century”, according to the Buenos Aires Times. A report from the Rosario Board of Trade found that annual beef consumption is now around 45kg per person, down from a peak of more than 100kg in the 1950s. Bloomberg attributed the decline to skyrocketing beef prices amidst a national recession. However, a shift to poultry, pork and plant-based diets due to greater nutritional awareness amongst consumers is also contributing, the newswire said. Argentina remains one of the biggest beef consumers globally, surpassing the UK and US (18 and 38kg per capita, respectively).
EU POLICY: The farmers’ organisation European Coordination Via Campesina has called on the EU to control agricultural prices and abandon free-trade agreements, including the long-stalled deal with the Mercosur South American trading bloc, Euractiv reported. “Farmers fear the Mercosur deal would result in markets being flooded with cheaper products”, it said. A separate Euractiv piece said that the European People’s Party is aiming to take the post of agriculture commissioner in the European Parliament in a move to solidify itself as “the farmers’ party”. Meanwhile, US paper producers have warned that new EU regulations requiring them to trace the sources of timber will cause price increases and shortages of diapers, sanitary pads and hygiene products, with Bloomberg reporting that “pulp supply chains are too diffuse to track all trees”.
‘CARBON LAUNDRY’: Brazil is “rac[ing]” to launch “one of the first major carbon emissions trading systems in the developing world”, Dialogue Earth reported. The emissions trading system aims to cover major polluting companies from sectors such as steel and cement, it added, but they would also be allowed to offset their emissions by buying credits from the voluntary market. This would need “careful regulation”, experts told the outlet, to ensure Brazil does not become “the carbon laundry of the world”. Dialogue Earth also covered controversies around “blue carbon” trading in China, where “most of the credits…involve the scientifically contentious matter of carbon sequestration by shellfish and seaweed”. Scroll.in, meanwhile, reported on “dubious” credits being generated by Himalayan hydropower projects.
WATER WARS: Amid ongoing drought in the south-western US, the country is “looking to parched northern Mexico to solve its water shortage”, Excelsior reported. The newspaper noted that the latest agreement between the two countries marks “the third consecutive year of water cuts from the Colorado River to Mexico”. In return for the reduction, Mexico will receive $65m “that will be used to improve water resources infrastructure”. Nearly two-thirds of northern cities and towns are already impacted by water shortages, including “a dozen municipalities living in a state of emergency”, Excelsior said. It added that 14 members of congress from Texas have requested the US “suspend aid to Mexico…until Mexico pays off its current water debt”.
DEFORESTATION DECREASE: Last year, Colombia “achieved its lowest deforestation rate ever recorded”, reporting a 36% decrease compared to the previous year, City Paper Bogota said. (Historical records in the country go back to 2000.) The figure represents a decrease of more than 50% over the last two years, “surpassing the initial target” set in the country’s national development plan, the outlet said. It quoted Colombian environment minister Susana Muhamad, who said: “It is a truly iconic year in this fight against deforestation.” However, Colombia Reports said that the reduction is “feared to be temporary” and that “the first quarter of this year indicated that deforestation had been going up again”.
DISPUTED MAPS: Indigenous communities in India’s western state of Gujarat have complained that district authorities rejected their forest rights claims based solely on satellite imagery collected by an autonomous state body, over other evidence such as testimonies and site inspections, IndiaSpend reported. Activists accused the GEER Foundation of “a lack of transparency”. Villagers asked to vacate their lands within 10 days told the outlet that the “notices came as a shock, as GPS and satellite imagery exercises conducted by local NGOs” support their claims. An official told IndiaSpend that the foundation “has now agreed to share their maps”, but said that “people give arbitrary estimates” of the size of their forest plots. Separately, the Financial Times reported that Australia has asked for a delay of the EU deforestation law regime citing “incorrect data”, with a spokesperson stating that “[t]he EU’s map is not a single source of truth”.
Watch, read, listen
BALANCING ACT: On her Feed the Planet podcast, Prof Sarah Bridle talked to researcher Barbara Bray about how to balance humans’ health with that of the planet.
COMEBACK KID: Mongabay carried a two-part series on the “re-introduction” of the Spix’s macaw that went extinct in the wild, but now faces an “uncertain future”.
STICKER SHOCK: In a new video, Al Jazeera explored how climate change has played a role in the global increases in food prices and inflation.
PORK OUT: Vox carried a long read that looked at how factory farming was “shoring up public support” by “funding favourable research” from US public university scientists.
New science
Mitigation and Adaptation Strategies for Global Change
Grape growers in parts of the Mediterranean should consider reducing their crop’s exposure to sun and optimising water usage to help vineyards adapt to climate change, according to new research. The researchers aimed to understand how climate change will impact wine-growing areas in Portugal, Italy, Turkey and Morocco. Using scenarios under moderate (RCP4.5) and very high emissions (RCP8.5), the researchers compared the main climate-related challenges these locations will face and assess the “best strategies to reduce the impacts of climate change at the national and regional levels”. The conclusions of the study “may support local growers” in optimising “sustainable production under changing climates”, the researchers wrote.
Severe droughts reduce river navigability and isolate communities in the Brazilian Amazon
Communications Earth & Environment
A new study found that severe droughts “routinely disrupt inland water transport and isolate local populations” in the Brazilian Amazon, resulting in restricted access to food, medicine, education and more. By combining historical records of river streamflow, maps of human settlements and news reports, researchers analysed the impacts of lowered river levels on communities near the Amazon River. They found that droughts over the past two decades “have not only caused exceptional low-water anomalies across the Amazon basin, but also dramatically increased the duration of the low-water period”, contributing to communities’ isolation. They concluded: “Given this new reality, Amazon countries must develop long-term strategies for mitigation, adaptation and disaster response.”
Science Advances
New research found that planted mangroves store nearly three-quarters of the amount of carbon stored by untouched mangroves over 20 to 40-year timescales. Analysing data from 684 planted mangrove stands around the world, researchers looked at the carbon storage both below and above ground and determined how carbon storage rates change over time. They found that planted stands that incorporate more than one mangrove species “would maximise [carbon] accumulation within the biomass compared to monospecific planting”. The authors concluded: “Our models also facilitate goal setting; performance measure development; and progress tracking in restoration, rehabilitation or afforestation projects.”
In the diary
- 15 July-2 August: Second part of the 29th Session of the International Seabed Authority Assembly and Council | Kingston, Jamaica
- 22-26 July: 27th Session of the FAO Committee on Forestry | Rome
- 27 July-2 August: 61st Session of the Intergovernmental Panel on Climate Change (IPCC-61) | Sofia, Bulgaria
This is an online version of Carbon Brief’s fortnightly Cropped email newsletter. Subscribe for free here.
Cropped is researched and written by Dr Giuliana Viglione, Aruna Chandrasekhar, Daisy Dunne, Orla Dwyer and Yanine Quiroz. Please send tips and feedback to cropped@carbonbrief.org.
The post Cropped 17 July 2024: Climate change and wine; Seabed mining talks; Argentina’s beef habit appeared first on Carbon Brief.
Cropped 17 July 2024: Climate change and wine; Seabed mining talks; Argentina’s beef habit
Four Ugandan farmers filed a case with London’s High Court on Tuesday, aiming to stop the East African Crude Oil Pipeline (EACOP) from starting to operate by asking the court to apply Uganda’s laws against the project’s UK-registered company.
The controversial 1,443-kilometre (897-mile) pipeline, majority-owned by French energy company TotalEnergies, aims to carry crude from Ugandan fields for export through neighbouring Tanzania. About 80% has been built so far, according to its developers.
The pipeline’s first oil exports are expected as soon as October, according to its developers, and the campaign group Avaaz, which is backing the farmers’ crowdfunded lawsuit, called it “one final chance to stop one of the worst oil pipelines on the planet”.
The claim, filed by London law firm Leigh Day, argues that EACOP Ltd’s role in developing and operating the pipeline breaches Ugandan laws that protect citizens’ right to a clean and healthy environment.
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Ugandan farmers use British court to try to stop East Africa oil pipeline
The farmers and their lawyers will argue that a UK-based entity linked to the East African Crude Oil Pipeline has breached Ugandan law and construction should halt -
French court rules Total must revise climate plan to account for all emissions
Oil and gas giant TotalEnergies has been given six months by a court to publish a more robust climate plan -
Uganda cites contentious IEA fossil fuel scenario backed by Trump administration
Critics of the African nation’s oil ambitions say referencing the International Energy Agency’s most pessimistic scenario for climate action is a risky policy
One of the claimants, Racheal Tugume, told a press conference she had been displaced from her land due to the pipeline’s construction, which she said had damaged local rivers, wildlife and ecosystems that communities depend on for their livelihoods just as erratic weather linked to climate change takes an increasing toll.
“I am very happy that there are people in countries like the UK who are listening to us, who are behind us and who have come to support us,” Tugume said, adding that she hoped the case would bring justice to communities affected by the pipeline.
Ugandan law in UK court
While the pipeline is a joint venture led by TotalEnergies, with smaller stakes owned by Ugandan, Tanzanian and Chinese national oil firms, it is operated by EACOP Ltd, a company registered to an office in London’s Canary Wharf financial district.
EACOP Ltd did not respond to a request for comment.
The claim appears to be the first attempt to have Uganda’s climate and environmental protections enforced in a foreign court, partly reflecting concerns over whether cases challenging the multibillion-dollar pipeline would get a fair trial in Uganda.
Ugandans living near new oil pipeline let down by compensation programmes
Concerns about access to a fair hearing are among the issues the court will consider when deciding if it should take on the case, said Matthew Renshaw, partner at Leigh Day.
Renshaw said that precedents including the Nigerian oil pollution case against Shell have shown that claims against British-registered companies for harms overseas can be successfully fought in UK courts.
“We are proud to represent the four brave principled individuals,” Renshaw said.
Constitutional protections
The pipeline project has already been subject to repeated lawsuits in several countries, none of which have succeeded. A climate lawsuit filed in Uganda more than a decade ago by a group of young people has yet to conclude. Another at the East African Court of Justice, brought by campaign groups against Uganda and Tanzania, was rejected on procedural grounds last November.
A separate ongoing lawsuit in TotalEnergies’ home country of France – a refiled version of an earlier failed claim – cannot stop EACOP going ahead, but it does seek damages from TotalEnergies for affected communities.
With the newly launched case, Leigh Day’s legal adviser Marc Willers said the claim draws on specific Ugandan laws in a bid to stop EACOP’s operations.
Uganda may see lower oil revenues than expected as costs rise and demand falls
These include the Ugandan constitution, a 2019 environmental law and the National Climate Change Act 2021, which gives Ugandans the right to bring a case before a court in circumstances where anyone or any entity threatens the country’s ability to mitigate climate change.
Stopping a “carbon bomb”
The pipeline, which will link Uganda’s Lake Albert oil fields to Africa’s east coast in Tanzania, has already displaced thousands of people and cuts through the Lake Victoria basin, one of East Africa’s major freshwater systems and a critical water source for around 40 million people.
According to the BankTrack non-profit, when the pipeline is at peak production, it will carry 216,000 barrels of crude oil per day and release over 33 million tonnes of carbon emissions each year. Over its full lifetime of 25 years, it is estimated to release about 379 million tonnes of greenhouse gas emissions across its value chain including construction, refining and product use.
A May 2026 report from Earth Insight also warns that the pipeline and related infrastructure could affect 158 wetlands in Uganda, 11 rivers, 44 protected areas and seven key biodiversity areas while disrupting about 2,000 square km of protected wildlife habitats.
This is why the primary focus of the UK court case is to stop the operation of the pipeline in its tracks, Leigh Day’s Willers said, calling it a “carbon bomb” that would worsen the world’s climate crisis.
Long wait for first hearing
While the purpose of the case is to stop the pipeline from launching operations, Renshaw said it could take about 12 months before the case gets a first hearing and about 18 months before it goes to trial.
Billions unlocked as Green Climate Fund agrees to spend more and save less
The farmers are, however, seeking an injunction to stop EACOP Ltd from proceeding with operations. In the event that shipments begin, the lawsuit will still seek to stop the pipeline from then on, Renshaw said.
“We will be doing what we can to expedite matters but it is possible that EACOP will have started operating the pipeline before the claim is heard. If that is the case, the claim would intend to halt operations from that point. For example, the pipeline may operate for just one year rather than 30-plus, resulting in far less harm,” he said.
The post Ugandan farmers launch UK court case against East African oil pipeline appeared first on Climate Home News.
Ugandan farmers launch UK court case against East African oil pipeline
Climate Change
Cited 7 July 2026: ‘Impossible’ heat | Global ocean record | Climate change and the ozone hole
Welcome to Cited, your essential guide to new climate research.
In the news
‘HEAT ALERT’: At least 25 people died as a “heat dome” smothered the eastern half of the US, reported the Guardian, with more than 20 states under “stifling temperatures more than 100F (38C)”. More than 140 million people were under heat alerts, the outlet said, with dead bodies found in “homes with no air conditioning, outside their residences, on the street and in parked cars”. Analysis by World Weather Attribution (WWA) found that the combined heat and humidity would have been “virtually impossible” without human-caused warming, reported the New York Times.
‘MORTALITY WILL RISE FURTHER’: Meanwhile, extreme heat continued to hit Europe, with Le Monde reporting on temperatures of 40C in France, Portugal and Spain again this past weekend, alongside “devastating” wildfires. Public Health France doubled its preliminary estimate of the “excess deaths” from the extreme heat in late June, from 1,000 to more than 2,000, according to the Guardian. The higher figure was still “probably an underestimate”, the agency said. Analysis published by Carbon Brief put the figure at 2,700 heat-related deaths. A WWA attribution study, covered by Carbon Brief, found that Europe’s June heatwave would have been “virtually impossible” even 50 years ago.
‘BOOST TO GLOBAL TEMPERATURES’: The UN World Meteorological Organization (WMO) “raised its forecast for the rapid emergence of a strong El Niño in the coming months, warning that the phenomenon is likely to drive global temperatures higher”, reported Reuters. A WMO scientist told the newswire that “El Niño conditions have emerged in the equatorial Pacific and there is a remarkable agreement between forecast models that this will be a strong El Niño”.
Research picks
Extremes
- The annual season when “intense” tropical cyclones occur has lengthened by 10-14 days per decade across the world since the 1980s | Nature Communications
- There is an “increasing” and “overlooked” global threat from glacial outburst floods from small lakes | Nature Sustainability
- Female smallholder farmers in sub-Saharan Africa experience crops losses 2-2.5 times greater than male smallholders in periods of extreme heat | Nature Sustainability
Policy
- The summaries for policymakers in Intergovernmental Panel on Climate Change (IPCC) mitigation reports over 2001-22 “have not yet become more solution-oriented while abiding by their policy-neutrality principle” | npj Climate Action
- Two-thirds of countries address inequality in their national pledges under the Paris Agreement – particularly in “countries with lower levels of human development and greater income inequality” | Climate and Development
- To “future proof” the Paris Agreement’s “well-below 2C” limit, it should be interpreted as a median “peak warming” of 1.6-1.8C, rather than a 66-90% chance of staying below 2C | Nature Climate Change
Land sink
- From 2001 to 2015, northern Eurasia absorbed about 0.47bn tonnes of carbon each year – around one-third of the total global land carbon sink | Global Biogeochemical Cycles
- Model simulations of potential land-use carbon emissions out to 2100 show that “deforestation and forest regrowth dominate variability” of emissions, with policy timing and ambition “exerting strong control” | Nature Communications
- Tropical forests are facing an increase in areas that exceed critical temperatures where their “photosynthetic system breaks down” | Proceedings of the National Academy of Sciences
Captured
On 21 June, global average sea surface temperature (SST) reached a record high for the day of the year, according to the Copernicus Climate Change Service (C3S). Daily SST for the global ocean, excluding polar regions, reached 20.86C on 21 June, exceeding the 20.83C reached on the same day in both 2023 and 2024, the C3S said. Global SST has remained at record levels for every day since. The conditions “could indicate the beginning of a new phase, leading, once more, to uncharted territory”, said C3S director Carlo Buontempo.
56 hours and 30 hours
The amount of time that the average lifespan of tropical cyclones in the north-east and north-west Pacific has shortened, respectively, over 1982-2024, according to a study in npj Climate and Atmospheric Science. This shorter lifespan “compresses the time available for weather forecasting and disaster preparedness”, the authors said.
Spotlight
The ozone hole and climate change
As a new “thought experiment” asks whether the hole in the ozone layer could, theoretically, have been identified decades before it was discovered, Carbon Brief explores the interactions between climate change and the ozone hole.
It is now more than 40 years since the discovery of the hole in the ozone layer over Antarctica, detailed in the journal Nature in 1985.
A study more than a decade earlier had predicted that chlorine-based substances – such as chlorofluorocarbons (CFCs) – could lead to the destruction of ozone in the stratosphere.
So, in theory, how early could the ozone hole have been detected?
New research, published in the Proceedings of the National Academy of Sciences, explored this very question.
Study co-author Prof Susan Solomon from the Massachusetts Institute of Technology is a leading atmospheric scientist. In the late 1980s, Solomon and colleagues identified the mechanism behind how CFCs were causing ozone depletion.
The new study is a “thought experiment”, Solomon told Carbon Brief, asking when scientists could have discovered the ozone hole had they had access to modern satellite observations.
“We found that depletion could have been detected as early as 1957 in the tropical upper stratosphere, where natural variability is especially small,” explained Solomon.
This would have been before the use of CFCs became widespread, Solomon added. Instead, early ozone depletion was caused by carbon tetrachloride, a chemical used as a cleaning agent, as well as in fire extinguishers and for producing refrigerants.
For many decades, the ozone hole and global warming have often been confused by the public and the media, Solomon explained:
“It’s common to imagine that because ozone is so important at shielding us from the UV [ultraviolet] light that causes skin cancer, then having less ozone must mean the Earth would warm up.”
For example, in a 1995 editorial, the Los Angeles Times congratulated the Nobel prize-winning chemists who identified the threat of CFCs to the ozone layer. The newspaper noted that these processes “threaten calamitous global warming by damaging the Earth’s protective layer of ozone”.
However, said Solomon, “the Earth is warmed much more by visible light – UV doesn’t really contribute, so ozone depletion doesn’t cause significant warming”.
Regional impacts
The depletion of ozone actually has a very small cooling effect at the Earth’s surface. But this is more than outweighed by the warming impact of CFCs and other ozone-depleting substances.
This warming impact means that efforts to reverse ozone depletion have had a beneficial impact on the climate.
The Montreal Protocol, a 1987 international agreement to phase out CFCs, “has played – and is playing – a very substantial role in safeguarding climate too”, said Solomon:
“It turns out that the CFCs and their replacement gases HCFCs [hydrochlorofluorocarbons] are strong greenhouse gases, so phasing out their production has not only avoided a lot of ozone depletion that would otherwise have occurred, it also had a big influence on global warming.”
HCFCs were considered as “transitional substitutes” for CFCs – they still damaged ozone, but to a lesser extent – until ozone-safe alternatives were commercially available.
Hydrofluorocarbons (HFCs), which are not ozone depleting, began to be used widely in the 1990s. However, HFCs are also potent greenhouse gases. HFCs and similar replacements are now being phased out under the 2016 Kigali Amendment to the Montreal Protocol.
While the ozone hole itself has only a very small impact on global temperatures, it does have a clear impact on the regional climate over Antarctica.
Prof David Thompson from Colorado State University, working with colleagues including Solomon, has published research demonstrating that “changes in southern-hemisphere winds linked to the stratospheric ozone losses extend all the way down to the ground in some seasons”, explained Solomon.
This has “reduc[ed] warming that would have occurred in interior Antarctica and enhanc[ed] warming in the Antarctic Peninsula region”, she said.
The knock-on impacts include “wind changes [that] actually extend beyond Antarctica to the mid-latitudes of the southern hemisphere, where they even affect rainfall”, she added.
Preprints to watch
Carbon Brief’s pick of new papers under review
- The drying impact over Africa from using stratospheric aerosol injections to stabilise global temperatures would only be minimised “when combined with a strong decarbonisation effort” | Earth System Dynamics
- The El Niño-Southern Oscillation and Indian Ocean Dipole could “shape” the playing conditions at the Rugby World Cup 2027 in Australia | Journal of Southern Hemisphere Earth Systems Science
- A “strong” weakening of the Atlantic Meridional Overturning Circulation (AMOC) would “profoundly alter the climate-carbon cycle system”, underscoring the “importance of explicitly accounting for AMOC risks in long-term climate assessments” | Earth System Dynamics
Noticeboard
- 6 July-25 September: Registration open for experts to review the first-order draft of the Intergovernmental Panel on Climate Change’s Working Group I report
- 7-15 July: UN High-level Political Forum on Sustainable Development, New York
- 19 July: Application deadline for a postdoctoral scholar in transdisciplinary climate research at Penn State University, US | Salary: unknown
- 22 July: Application deadline for PhD project on “climate change impacts on the Antarctic coastal ocean carbon sink” at the University of East Anglia, UK
- 26 July: Application deadline for PhD projects on “AI for land-atmosphere feedbacks during hydroclimatic extremes” at the Helmholtz School for Integrated Data Science in Environmental & Life Sciences, Germany
- 29 July: Application deadline for an assistant professor in Earth and environmental geosciences (palaeoclimatology) at Colgate University, US | Salary: $97,500-101,500
- 31 July: Application deadline for PhD project on Arctic Ocean methane oxidation at Stockholm University, Sweden
Cited is researched and written by Cecilia Keating, Robert McSweeney, Ayesha Tandon, Daisy Dunne and Dr Giuliana Viglione.
Please send tips, feedback and upcoming climate research to cited@carbonbrief.org
This is an online version of Carbon Brief’s fortnightly Cited email newsletter. Subscribe for free here.
The post Cited 7 July 2026: ‘Impossible’ heat | Global ocean record | Climate change and the ozone hole appeared first on Carbon Brief.
Cited 7 July 2026: ‘Impossible’ heat | Global ocean record | Climate change and the ozone hole
In June 2026, a record-breaking heatwave swept across Europe, with France among the first and hardest hit countries.
In a new analysis, we estimate that the extreme conditions caused more than 2,700 heat-related deaths in France.
We also show how France’s extreme temperatures in June exceeded projections from climate models.
Our findings illustrate the human toll of extreme weather as the world warms.
We also highlight the challenges in projecting the magnitude of future heatwaves and their impacts on people.
Outpacing projections
For most of this century, Europe has seen summer heat extremes that outpace projections from climate models.
Several different factors likely explain this trend, including reductions in planet-cooling aerosols as nations have cleaned up their air pollution, as well as changes in atmospheric circulation patterns, which models struggle to represent.
In June 2026, daily high temperatures averaged across France reached 36.9C, shattering the previous June record set in 2022 by 2.4C.
[For more on the impacts and coverage of Europe’s June heatwave, see Carbon Brief’s explainer.]
The rise in observed temperatures in France has outpaced projections made by climate models, with June maximum temperatures more in line with what was expected for the 2070s.
This is illustrated in the figure below, which shows how France’s average maximum daily high temperature for June recorded in 2026 (black line) compares to climate model projections (blue and orange lines).
Counting the death toll of climate change
The downstream impacts of these extreme temperatures are lethal.
Scientists are able to estimate the death toll of high temperatures in many locations, depending on the availability of mortality and climate data.
There are several ways to do this.
One option is to examine death certificates to see which deaths have been directly recorded by physicians as related to heat. However, there is strong evidence that this method significantly undercounts heat-related deaths, as most death certificates do not consider environmental factors such as heat when diagnosing the cause of death.
Alternatively, it is possible to calculate the rate of total (“all-cause”) mortality in a given time period relative to previous time periods – for example, by comparing the total number of deaths in June 2026 compared to the average of previous Junes. This “excess deaths” figure can be used as an estimate of the deaths from a heat wave.
Using this approach, Public Health France attributed around 2,000 deaths in France to the extreme heat in the week of 22-28 June.
Finally, scientists can use long-term data on overall mortality and correlate changes in mortality with changes in temperature to understand the statistical relationship between the two.
Research published in Proceedings of the National Academy of Sciences in 2025 that used this third approach found that mortality rates in France increase rapidly in cold or hot conditions as daily maximum temperatures depart further from approximately 20C.
This pattern of a U-shaped response of mortality to temperature – shown in the figure below – is very consistent across time periods and regions around the world.
To calculate the death toll of the June 2026 heatwave in France, we compared observed temperatures over 12-29 June to their baseline average over 1980-2025.
The difference between these two temperatures helps us understand how many more people died than they would have in the absence of such extreme conditions.
Over 12-29 June, we found that France has experienced around 2,700 heat-related deaths above the average baseline. Day-to-day heat-related mortality rates rose from less than 100 to almost 300 on the hottest days of 24 and 25 June.
This is shown in the graph below, which illustrates the cumulative total heat-related deaths seen in France over the two-and-a-half week period. The inset shows how heat-related deaths fluctuated on a day-to-day basis during this time.
Recent analysis by World Weather Attribution has already shown that human-caused climate change increased the frequency and intensity of the June heat wave across Europe.
Meanwhile, previous research has shown there is substantial evidence that heat-related mortality in Europe has already been elevated by greenhouse gas emissions.
As a result, we can be confident that at least some of the more than 2,700 deaths already seen in France are directly due to the burning of fossil fuels.
Calculating climate risk
In April, the UN-led body responsible for coordinating the work of climate modelling centres – the Coupled Modelling Intercomparison Project (CMIP) – unveiled a set of seven new emissions scenarios.
These are designed to replace the previous scenarios that have been used by scientists to understand how the climate might change in the future. They will feed into the upcoming seven assessment report (AR7) of the Intergovernmental Panel on Climate Change (IPCC).
The range of future emissions in the new CMIP scenarios is smaller, with scenarios of very high or very low emissions no longer on the table.
The retirement of the very-high emissions scenario – known as “RCP8.5” – led to certain commentators in the media and in politics, including US president Donald Trump, arguing that the risks of climate change had been “overstated”.
[For more on false and misleading claims around the new emissions scenarios, see Carbon Brief’s factcheck.]
Our analysis of June’s heat-related deaths in France suggests that, even if the most severe emissions pathways are no longer needed, climate impacts are taking a heavy toll on society.
Moreover, the temperatures seen in France show that climate models continue to underpredict the magnitude of heatwaves for a particular level of global warming.
This is because greenhouse gas emissions are only a first step in estimating the impacts of climate change.
The second step is converting emissions to changes in the climate at both the global and local levels – or hazards. This includes heatwaves, flash floods and droughts.
The third step is to determine how changes in the hazards will affect local populations. This can be determined by calculating people’s exposure and vulnerability to hazards.
Substantial uncertainty persists at every stage of this sequence.
For example, scientists do not know exactly how the global climate will react to ever-rising greenhouse gas emissions – nor the extent to which global temperature increases will drive local climate hazards. We also do not know how climate change at a local level impacts human health outcomes.
Managing the future of heat risk
Almost all heat-related deaths are preventable.
Adaptation options, such as air conditioning, heat action plans and social support for isolated people, will be crucial as the climate moves away from the typical conditions that people are used to.
Our previous research showed that France made a lot of progress reducing heat-related mortality after the deadly 2003 summer heatwave by taking many of these actions.
Adaptation can reduce deaths, but it cannot eliminate the risk created by continued warming.
Without a move away from fossil fuels, future heatwaves will keep testing the limits of public health systems and more people will die.
The post Guest post: France’s June heatwave caused more than 2,700 heat-related deaths appeared first on Carbon Brief.
Guest post: France’s June heatwave caused more than 2,700 heat-related deaths
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