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China Briefing handpicks and explains the most important climate and energy stories from China over the past fortnight. Subscribe for free here.
Key developments
China pushes back on US and EU ‘overcapacity’ complaints
‘FAIR’ COMPETITION: German chancellor Olaf Scholz and US treasury secretary Janet Yellen have visited China in the past fortnight, amid concerns regarding China’s dominance in clean-technology supply chains. Scholz commented in Shanghai that “competition must be fair” and, “in other words, that there is no dumping, that there is no overproduction, that copyrights are not infringed”, Reuters reported. Similarly, in response to a question on whether the US would place tariffs on Chinese exports, Yellen told CNBC that she “wouldn’t rule out anything at this point. We need to keep everything on the table.” Mary Lovely, senior fellow at the US-based Peterson Institute thinktank, told the Financial Times that Yellen’s visit to China seemed “like the best indicator yet that new tariffs on China will be coming, no matter who wins” the upcoming US presidential election.
WIND INVESTIGATION: Chinese premier Li Qiang told Yellen that China’s clean-technology industries “make an important contribution” to the global energy transition, the Hong Kong-based South China Morning Post said. Commerce minister Wang Wentao echoed this during a visit to Europe, saying that he does not understand “how the European Commission carries the banner of sustainable and green development and then takes protectionist actions”, Reuters reported. This comes as the EU opened another subsidy investigation into Chinese wind turbine companies, which will focus on windfarms in Spain, Greece, France, Romania and Bulgaria, the Financial Times said. An analysis by Reuters noted that “the supply of Chinese wind turbines for EU projects is relatively small and the European market is still dominated by domestic players”.
REACTION FROM CHINA: State news agency Xinhua reports that foreign ministry spokesperson Lin Jian said at a press conference that “the notion that China’s overcapacity harms the global market is a complete fallacy”, adding “China’s leading edge in new energy is gained through strong performance and full-on market competition, not government subsidies” and “we hope relevant countries will keep an open mind, embrace fair competition”. State-run newspaper Global Times published an opinion piece by Huo Jianguo, vice chairman of the China Society for World Trade Organization Studies, saying the “rhetoric lacks logic, aimed at stymieing China’s development”. The state-run China Daily quoted Zhang Xiang, researcher at North China University of Technology, saying that the problem has been “exaggerated” and that China “should not be blamed for offering cost-effective new energy technologies”.
ANALYST REACTIONS: Nicholas Lardy, fellow at the Peterson Institute, told Reuters that he was “sceptical” about the “overcapacity” concerns, adding “if you think about it, it means every country should only produce what it consume[s] itself. That means no trade.” On Twitter, Chucheng Feng, partner at Beijing-based Hutong Research, said that China sees overcapacity arguments “as an attempt to undermine China’s ambition to be a global leader in the green transition”, meaning that they carry “more significant…implications than any previous such calls”.
China to build a ‘green financial’ system and more support for goods trade-in
‘GREEN FINANCE’: China’s central bank and six other ministries jointly issued “guiding opinions” to build a “world-leading” financial support system within five years, promoting “green and low-carbon developments”, reported Beijing News. The document calls for establishing unified standards, including “carbon accounting” methods.
EXPERT VIEWS: Luyue Tan, senior carbon analyst at LSEG, told Carbon Brief that the policy is a delayed update aimed at redesigning China’s financial policies to facilitate its “dual carbon goals”. Tan added: “This guideline connects two previously separate markets in China – green finance and carbon market – which are led by different government entities and bodies with varied focus.” The integration of the two markets will also contribute to new developments in the field, Guoqiang Qian, general manager of Chinese thinktank Sinocarbon, told Carbon Brief. He said: “The biggest problem in the Chinese carbon market is the lack of standards. The financial market could provide examples.”
TRADE-IN STANDARDS: The Chinese government announced a goal on 10 April to raise 294 environmental standards by 2025, including standards on goods trade-in and recycling, reported Xinhua. The announcement came after the release of an action plan to “promote the large-scale renewal of equipment and the trading-in of consumer goods” last month. (Read more in China Briefing from 21 March). China Daily quoted Zhao Chenxin, deputy director of the National Development and Reform Commission, saying China “will leverage central investment and central fiscal funds to offer financial support for [the policy]”. Zhao was also quoted by state-run newspaper People’s Daily where he said the promotion of equipment renewals and trade-in is the overarching policy in a new “1+N” policy grouping.
MORE TO COME: State news agency Xinhua reported that the premier Li Qiang approved the “energy saving and carbon reduction action plan for 2024-2025”, the details of which have yet to be publicly disclosed. The news agency said the plan recommends combining energy conservation and carbon reduction in key areas and also emphasises the promotion of equipment renewal and consumer goods trade-ins.
Mass new coal constructed in 2023 and 300m tonnes to be reserved
NEW COAL: China accounted for 95% of the world’s newly started coal power construction activity in 2023, according to Global Energy Monitor (GEM). Construction began on 70 gigawatts (GW) of new capacity in China, up four-fold since 2019, compared with less than 4GW of new coal power construction starting in the rest of the world – the lowest since 2014, the report said. In addition, the construction of coal-fired power plants globally – excluding China – declined for the second year in a row. However, coal power plant retirements were also at the lowest level since 2011, the report added. Carbon Brief published an in-depth summary of the report.
RESERVE COAL: China announced plans to establish a coal production reserve system by 2027 to guarantee “supplies of [coal] to power plants” and “stabilise thermal coal prices”, according to a joint document released by the National Development and Reform Commission (NDRC) and the National Energy Administration (NEA), Chinese economic outlet Yicai reported. Science and Technology Daily said that the document aims to achieve annual production of 300m tonnes of coal by 2030 for China’s reserves and to facilitate the role of coal as “a bottom-line guarantee in energy supply”. Industry outlet BJX News said that coal reserve production capacity could be used for “extreme” circumstances, such as “drastic uncertainties in the international energy market, extreme weather or sudden changes in the supply and demand situation”.
Spotlight
Interview: China Photovoltaic Industry Association on EU trade
Earlier this month, the European Commission launched investigations into two Chinese solar firms, saying “there are sufficient indications that both have been granted foreign subsidies that distort the [EU’s] internal market”.
Carbon Brief interviews Liu Yiyang, deputy secretary-general and spokesperson of China Photovoltaic Industry Association (CPIA), and gathers his views on the future for Chinese solar in Europe. The interview is edited for clarity and length.
CB: How important is the European market for Chinese solar firms?
Liu Yiyang: Europe is a very important solar market. According to Politico, more than 80% (about 45GW) of the newly added solar installations in Europe last year came from China. In addition, over the past year, Europe’s mainstream solar panel module prices fell from €0.3 per watt in March 2023 to €0.14/watt in April 2024. In terms of power prices, it can be said that Chinese modules have significantly reduced the cost of solar systems as well as the overall energy cost in Europe.
The European solar market and China’s solar manufacturing industry are complementary and mutually beneficial. Under the backdrop of the green energy transition, there is great potential for more solar cooperation between China and Europe.
CB: The European Commission says state subsidies may have given the Chinese solar firms an “unfair advantage” over their competitors. Do you agree? What are your thoughts on Chinese subsidies in the solar sector?
LY: In China, the central government provides no subsidies for the solar market or the solar manufacturing sector. There is a small amount of research and development funding with a modest purpose to support pilot testing and industrialisation, and technological advancement of the global solar industry. This is commonly practised across the world.
For example, in 2017, the US Department of Energy provided $46.2m in funding for 48 solar projects under its SunShot program. In August 2022, the US passed the Inflation Reduction Act (IRA) to invest more than $300bn to support renewable energy. Since then, many companies suspended their investments in Europe and instead relocated their production plans to the US. On 8 January 2024, the EU approved Germany a state aid of €902m to support a Swedish company Northvolt to establish an EV battery plant in Germany. The EU also uses subsidies to enhance its global product competitiveness.
Reuters reported that EU countries are concerned that their companies will lose out because of IRA tax credits, arguing that this violates the World Trade Organization’s principle of non-discrimination. The European Parliament explicitly stated that the IRA has been criticised for its “Buy American” style.
In summary, it is not the state subsidies in China that have given enterprises an unfair competitive edge, but rather the US through the IRA and its implementation details causes a world race for industrial policy, in breach of WTO rules.
CB: How damaging do you think the investigations will be for trade between China and the EU?
LY: We suggest that the investigation should be based on the principles of objectivity, fairness and must be supported by sufficient evidence. Groundless speculation can only harm the Sino-European trade relations and may even expand to non-solar areas.
Ungrounded countervailing investigation will also slow down the pace of Europe’s future green energy transition and even affect the realisation of the net-zero emissions target of the global energy industries.
CB: The idea of “de-risking” supply chains and “decoupling” from China has been circulating in the EU for a while now. What would it mean for global solar expansion – and efforts to tackle climate change – if decoupling succeeds?
LY: There has been plenty of talk of “de-risking” or “decoupling”. The argument is highly dubious and unclear where the so-called risks come from. China has never taken any actions, nor have we verbally sought to prevent European customers from buying Chinese solar products. The so-called risk does not make sense.
Energy, with solar as one source, is fundamental to all manufacturers. The lower the cost of energy, the greater the competitive advantage of the European manufacturing industry. China’s solar products have made a great contribution to reducing European energy costs over the past decades and we are willing to provide more help.
If “decoupling” or “derisking” is forcibly induced by external agitation, disregarding objective economic laws, the ones who stand to suffer will not only be Chinese businesses, but also European citizens and the broader European manufacturing sector. Europe has suffered from rising energy prices and inadequate energy supply for a long time. Similarly, if China and Europe cannot maintain close cooperation in the solar sector, both will face tremendous challenges in addressing climate change.
CB: In general, what do you think the future will be for the Chinese solar industry in the EU?
LY: We believe that, without unnecessary interference, the prospects for Sino-European cooperation in the solar industry are enormous. Europe can leverage its advantages in capital and technology, and China can utilise its large-scale manufacturing and industrialisation, continuously developing more efficient and more cost-effective solar products.
At the same time, as Europe has considerable experience in constructing large-scale grid with high renewable energy penetration, the two sides can cooperate on innovative power systems and virtual power plants. Sino-European cooperation in the solar industry is not only expected to benefit our two regions, but the whole world.
Watch, read, listen
CLIMATE AND FOOD PRICE: Research centre the Manchester China InstItute released a video on YouTube of Prof Tim Brook from British Columbia University, discussing how climate change affected food prices in China in the pre-industrial age.
DECARBONISATION UPDATES: David Roberts on his Volts Substack invited Lauri Myllyvirta, lead analyst from Centre for Research on Energy and Clean Air (and frequent Carbon Brief contributor), to talk about China’s recent efforts on decarbonisation.
CHINESE EV VS TESLA: The Daily podcast of the New York Times spoke to investigative reporter Mara Hvistendahl about how Elon Musk may have given Chinese EV firms the tools to “beat Tesla at its own game”.
‘STEVE JOBS’ OF CHINA: The Financial Times profiled Lei Jun, founder of Xiaomi, “an Apple copycat”. Xiaomi recently joined the EV market and launched its SU7 model, which closely resembles the Porsche Taycan, the newspaper said.

Chinese loans to African nations have declined steadily from a peak of $23bn in 2016, according to a report by the Boston University Global Development Policy Center and the African Economic Research Consortium. Around one-third of all Chinese loans between 2000 and 2022 – some $134bn – were in the energy sector, the report adds, with $26bn during this period going to fossil fuel projects. However, no new fossil fuel loans have been issued since 2019.
New science
Carbon emissions trading policy and climate injustice: A study on economic distributional impacts
Energy
A new study analysed the impact of China’s emissions trading scheme (ETS) on the distribution of “benefits and responsibilities” among the local economies of different Chinese cities. It concluded that the implementation of the ETS improves GDP, on average, but can also harm innovation and foreign investments in cities. In addition, the researchers noted that the policy has the potential to “enlarge the gap between developed and developing areas”.
Forest carbon storage and sink estimates under different management scenarios in China from 2020 to 2100
Science of the Total Environment
A new study employed three tree-growth models – the Richard, Hossfeld and Korf models – to evaluate the carbon sink potential of existing forests and afforestation in China from 2020 to 2100. The study estimated that in 2020, the carbon stored in China’s forests reached 7.62bn tonnes of carbon, equivalent to 28bn tonnes of carbon dioxide. It further suggests that by 2100, 19.59bn tonnes of carbon could be stored.
China Briefing is compiled by Wanyuan Song and Anika Patel. It is edited by Wanyuan Song and Dr Simon Evans. Please send tips and feedback to china@carbonbrief.org
The post China Briefing 18 April: Clean-tech ‘overcapacity’; New coal construction; Interview with China Photovoltaic Industry Association appeared first on Carbon Brief.
Climate Change
Most “zombie credits” locked out of new UN carbon market after China and India snub
China and India have declined to back any of their old United Nations carbon credit projects seeking to sell offsets under the new UN market, driving a cull of nearly three-quarters of applicants, analysis of official data shows.
Only 415 out of more than 1,500 projects and programmes hoping to move from the Clean Development Mechanism (CDM) to the new carbon market set up under Article 6.4 of the Paris Agreement won the approval of their host governments by the 30 June deadline – a crucial step in transitioning them.
The two Asian giants, home to two-thirds of all applicants, account for the bulk of the exclusions. Brazil, the other heavyweight of the CDM era, took the opposite path, approving nearly all of its projects in a last-minute rush that leaves it with the largest number of activities still in the running to sell credits under the new mechanism.
Carbon market watchers have long regarded the CDM, set up under the Kyoto Protocol which has now been largely replaced by the Paris Agreement, as largely discredited for failing to drive real emission cuts. They also warned that letting its projects live on could dent confidence in the mechanism’s successor.
If all projects seeking transition had been successful, they could have flooded the market with up to more than 900 million credits generated with largely outdated rules, according to UN estimates. One credit is equivalent to one tonne of carbon dioxide (CO2) and 900 million tonnes is similar to Japan’s annual emissions.
‘New era’
Injy Johnstone, senior research fellow at the Munich-based Max Planck Institute, said the failure of most projects to clear the hurdle sent a significant signal that carbon trading had entered a new era. “The system is trying to remove some of the hot air that had inflated it in the past,” she told Climate Home News.
“The lack of transition is the biggest contribution that Article 6 has made to climate yet,” she added, arguing that leaving “zombie credits” in the market creates confusion, especially for buyers that might not realise these units have lost their value.
Among the schemes that failed to win government approval are nine programmes promoted by fossil fuel companies over a decade ago to subsidise the construction of gas plants in the Global South, which Climate Home News has previously reported on.
Fossil fuel firms seek UN carbon market cash for old gas plants
But one of them, supporting the Ressano Garcia gas plant in Mozambique, could still profit from the new market after the country’s government granted its approval on deadline day itself.
Brazil leads projects transition
Established in 1997 under the Kyoto Protocol, the CDM allowed rich countries to meet part of their climate obligations by financing emission-cutting projects in poorer ones. It drew widespread criticism over its patchy human rights record and for failing to deliver promised climate benefits. Backers of the Article 6.4 market say it is a higher-integrity successor.
CDM projects were given a route back into the new mechanism under certain conditions at COP26 in Glasgow in November 2021, when governments agreed the rules for the Paris Agreement market.
Project developers had until the end of 2023 to apply and host governments were originally given until the end of 2025 to grant approval. But, after requests from many developing countries for an extension, at COP30 in Belém countries agreed to push the deadline back six months to the end of June.
Brazil was the single largest beneficiary of the decision, with all of its 92 approvals coming during the extension window. Hydropower plants, landfill gas schemes and wind farms make up the bulk of the South American country’s surviving portfolio, and hydro is the single most common project type in the global transition pipeline.
Peru greenlit the move of nearly a dozen hydropower plants, Thailand backed a batch of biogas and waste-to-energy schemes, and Mexico squeezed all of its approvals – including a controversial industrial gas project – into the final week. African nations including Zambia, Malawi and Ethiopia backed programmes aiming to switch households to cleaner cooking stoves, which have the potential to generate millions of offsets and are set to be the biggest source of credits among the surviving projects.
Long way from selling credits
Securing government support does not mean a scheme can now automatically sell credits under the Article 6 mechanism. Developers are required to submit additional documentation by the end of 2026 demonstrating that their programmes respect the mechanism’s stricter rules on environmental and social safeguards and on the risk of emission cuts being reversed. The Article 6.4 Supervisory Body, the mechanism’s regulator, has the final say on which projects are allowed into the market.
Those that make it through can sell credits for emission reductions achieved between 2021 and 2025 under the old CDM methodologies, with some adjustments aimed at preventing the creation of excess credits not backed by real emission cuts. For reductions achieved from 2026 onwards, projects will need to switch to new methodologies, which the regulator is currently developing.
So far, 30 programmes have completed the process, and only two cookstove projects in Myanmar have been formally approved to issue credits.
Civil society groups have called for an investigation into the activities in Myanmar over its ties to Myanmar’s military junta – which the UN says is guilty of human rights abuses – and allegations of “massively” overstating its climate impact.
The company behind the scheme said its engagement with authorities “should not be interpreted as political endorsement” of the junta, while disputing the calculations underpinning the claim that too many credits had been issued.
The post Most “zombie credits” locked out of new UN carbon market after China and India snub appeared first on Climate Home News.
Most “zombie credits” locked out of new UN carbon market after China and India snub
Climate Change
Debriefed 17 July 2026: UK ‘firewave’ | Fossil-fuelled heat deaths | London’s Natural History Museum spotlights climate
Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Heat and firewaves
‘FIREWAVE’: Wildfires ravaged Europe and North America this week. France utilised water-dumping planes collecting from the Seine to contain a fire in the Fontainebleau forest near Paris, according to the Associated Press. The Financial Times reported that the UK has had “25 non-consecutive days with temperatures of 30C or more, including nine days above 34C”, creating a “firewave” and putting pressure on emergency services. Meanwhile, an “orange haze from Canada wildfires” could be “seen in Ontario and northern US”, said BBC News.
‘NEW NORMAL’: Climate events previously seen as extreme are becoming the “new ‘normal’”, said the Met Office, in a report on the UK’s climate. While last year was the UK’s hottest on record, rising temperatures mean it is expected to be surpassed in the next few years, reported Reuters. Liz Bentley, head of the Royal Meteorological Society, told the Guardian that “climate change has been described by scientists for many years but is now increasingly being felt by the UK population in their own homes and communities”.
Around the world
- ELECTRIFYING PUSH: The European Commission has announced a target for electricity to account for 46% of energy consumption across the bloc by 2040, reported Carbon Pulse. The commission has also made plans to adapt its emissions trading system to “bring relief to industry”, it said.
- FALLING OIL: The International Energy Agency said that global oil demand is expected to decline this year for the first time since 2020, reported the Associated Press.
- US ROLLBACKS: Trump cuts to clean energy support “led to the cancellation or delay of $83bn in investment across hundreds of projects”, reported Reuters. The Trump administration has also changed environmental law to allow development in the habitats of endangered species, according to CNN.
- BURNHAM BEGINS: Incoming UK prime minister Andy Burnham is preparing to announce new North Sea drilling “within days of taking office”, said Bloomberg. Carbon Brief looked at 28 statements that Burnham has made about climate change and fossil fuels.
- DRY JULY: Drought in Uganda led to significant crop losses and at least 16 deaths from starvation, said BBC News.
- ON AI: Australia planned to implement restrictions on energy and water usage for datacentres “amid [an] AI boom”, said the New York Times.
38%
The drop in Brazilian Amazon deforestation in the first half of 2026, compared to last year, reported Al Jazeera.
Latest climate research
- The area of land burned by wildfires in Africa each year has reduced due to a shrinking dry season | Geophysical Research Letters
- Most people do not distinguish between climate adaptation and mitigation when thinking about tackling climate change | Climate Outreach
- An “effort-sharing framework” has been developed to support progress towards the Paris Agreement | npj Climate Action
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)
Captured

Carbon Brief explained how more than 1,000 heat-related deaths in England and Wales during May and June were attributed to climate change, accounting for almost half of all heat-related deaths experienced during those months. The article also unpacked the different methods for estimating heat deaths around the world.
Spotlight
Natural History Museum exhibits climate change
This week, Carbon Brief interviews Meaghan Macdonald, senior project and programme manager for London’s Natural History Museum, about their first permanent climate-themed exhibition, Fixing Our Broken Planet.
Carbon Brief: Why are programmes such as Fixing Our Broken Planet so important?
Meaghan Macdonald: One of the main things we’re trying to achieve with Fixing Our Broken Planet is to place the museum as a convener of conversations around the planetary emergency…trying to bring together the different groups of people who need to be involved in this conversation in order to work together to find a solution.
And we find that a lot of the people who come into the gallery weren’t necessarily coming here to see it; they come across it, which is a really great way to engage people who may not have been engaged in that discussion previously.
CB: How does the exhibition engage and inspire visitors?
MM: A driving force for this exhibition is that you are dealing with a subject matter that can be quite disheartening, and one of the things that we were very careful about is to try to make sure that woven throughout the scientific data… is a sense of hope… to enable people to feel empowered to make a difference.
We were able to do things like our “what you can do” labels, which give an example that people can take away with them. We also have “conversation starters”, which is a digital screen that asks people a series of questions related to the planetary emergency. Things like: “Should we mine the deep sea to power the green economy?”…And there’s no right or wrong answer.
We [also] set out very specifically to…forefront the science that’s happening here. We know from multiple studies from thinktanks and organisations that people actually trust our scientists the most.

CB: The museum has set out a goal to “create advocates for the planet”. What does this mean? How does it relate to the exhibition and the museum’s wider climate action?
MM: The aim of the museum is to get to a place where both people and the planet thrive. Being a library of the natural world, it is our duty to be standing up for it and to help people find their way, fighting for nature’s side.
In order to create those advocates, the aim of the [exhibition] and the wider advocacy programmes at the museum is to try to find ways to bring all these people [individuals, policymakers, industry, scientists] together.
We have the wider programme with Fixing Our Broken Planet. We have Generation Hope…a free graphic panel version of our display in the gallery that we have been able to get into a number of venues in Bangalore…the very long-standing and beloved wildlife photographer of the year [exhibition]…our urban nature movement…[and] an initiative that we are doing with the Department for Education called the National Education Nature Park.
Watch, read, listen
STUBBORN HOPE: For the Conversation, climate scientist Prof Peter Stott argued that researchers need to “talk more about the very worst-case scenarios” and the possibility for action.
EXTREME: Vox’s the Gray Area podcast spoke to New York Times journalist David Wallace-Wells about the possibility of a “Godzilla” El Niño.
RESPONSIBILITY: For Climate Home News, two researchers from the Center for International Environmental Law explored how “major emitting countries knew of climate risks decades earlier than claimed”.
Coming up
- 13-31 July: Meeting of the International Seabed Authority assembly and council, Kingston, Jamaica
- 17-19 July: 3rd International Conference on Environment and Sustainable Development, London
- 19 July: Presidential election, São Tomé and Príncipe
Pick of the jobs
- Zero Carbon Analytics, research lead | Salary: Unknown. Location: Remote
- Met Office, ocean climate scientific manager | Salary: £54,515-£58,582. Location: Exeter
- National Trust, land use and nature delivery partner | Salary: £44,499. Location: Newcastle or York
DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.
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The post Debriefed 17 July 2026: UK ‘firewave’ | Fossil-fuelled heat deaths | London’s Natural History Museum spotlights climate appeared first on Carbon Brief.
Climate Change
Q&A: Europe’s May and June heatwave deaths – and how they were counted
Recent weeks have seen a flurry of reports from public health authorities and scientists that estimate the deaths caused by Europe’s record-breaking summer heatwaves.
In France, the national public health agency reported 2,025 excess deaths over the week where the heatwave peaked in June.
Authorities in Germany and Netherlands put the excess death toll during the same seven-day period at 5,753 and 533, respectively.
An analysis from climate scientists in Carbon Brief found that France saw more than 2,700 heat-related deaths over 17 days in June.
Separate research estimated there had been 2,700 heat-related deaths in the UK’s May and June heatwaves – 42% of which had been caused by human-caused climate change.
There are a number of methods for how academics and governments tally deaths caused by extreme heat, each with their own advantages and drawbacks.
Here, Carbon Brief looks at the different ways scientists and public health authorities have calculated the death toll of Europe’s record-breaking summer heat.
- How established is the science of calculating heat deaths?
- What are the different approaches to counting heat deaths?
- What do the latest figures show for Europe’s May and June heatwaves?
- What are the pros and cons of the ‘excess deaths’ method?
- What are the pros and cons of the ‘statistical modelling’ method?
How established is the science of calculating heat deaths?
Economists and epidemiologists have been studying the relationship between heat and mortality for nearly a century.
A pioneering study published in 1923 by geographer Ellsworth Huntington and economist Margaret Justin that looked at mortality data for New York City over 1882-88 found that deaths increased rapidly as temperatures rose above 17C.
As global temperatures have risen in response to human-caused carbon emissions, scientists have increasingly sought to understand how warming could impact mortality.
The study of mortality caused by specific heatwave events dates back a few decades, with a 1995 heatwave in Chicago among the earliest events to be studied in detail.

Over the past decade, a growing number of studies have gone a step further, by estimating the number of deaths caused by a specific heatwave event and then attributing a percentage or number of those deaths to human-caused climate change.
Carbon Brief covered the first study of this type, which was published in Environmental Research Letters in 2016 and focused on a 2003 summer heatwave that caused tens of thousands of deaths across Europe.
The study estimated that 506 of the 735 summer fatalities in Paris and 64 of the 315 in London were a result of human influence on the climate.
More recently, a study in Climatic Change found that 27% of deaths in a 2018 heatwave in Zurich, Switzerland were linked to human-caused climate change and a paper in Science Advances estimated that 11-15% of deaths in a 2021 heatwave in British Columbia were attributable to global warming.
Dr Christopher Callahan, assistant professor at the O’Neill School of Public and Environmental Affairs at Indiana University, tells Carbon Brief this type of “two-step” study has “really exploded” in recent years:
“It is really only in the last five to 10 years that we have seen this, partly because it does require interdisciplinary expertise. You need people who know how to run the epidemiological models and you need a climate analysis of the counterfactual [world] without climate change, which is its own effort.”
What are the different approaches to counting heat deaths?
A central challenge in estimating deaths from a heatwave is that heat is rarely recorded as the primary cause of death on death certificates.
However, exposure to high temperatures has wide-ranging effects on the human body, including the strain of keeping cool. This effort places pressure on the heart and kidneys.
As a result, heat extremes can worsen health risks from chronic conditions and cause acute kidney injury. Researchers have linked heat to increased mortality from respiratory and cardiovascular diseases, as well as dementia and Alzheimer’s.
As a result, public health authorities and scientists cannot depend on death certificates for a full count of heat-related deaths. They instead estimate heat deaths using a number of different approaches, each with assumptions baked into their calculations.
Dr Garyfallos Konstantinoudis, who researches methods for calculating excess mortality due to extreme events at the Grantham Institute for Climate Change and the Environment at Imperial College, tells Carbon Brief there is “no ground truth” when it comes to tallying heat-related deaths:
“We don’t know what the heat-related deaths are, so we rely on different models to describe the picture.”
This makes the study of deaths from heatwaves similar to those from air pollution, he says:
“This sort of health-impact assessment has been done for years on studies related to deaths from air pollution, which have the same problem. Air pollution, until very recently, was not recorded on death certificates.
“[However], for air pollution, the [scientific] literature is much larger, so no one questions that air pollution is toxic and kills. This sort of messaging for heat is more recent.”
There are, broadly speaking, two approaches to calculating deaths during a heatwave.
The first involves counting the number of excess deaths relative to a period in the past.
This method – often referred to as an “excess deaths” approach – looks at how many people died during a particular time period compared to a baseline period where there was no heatwave.
To do this, public health authorities and researchers rely on official death figures reported by country authorities.
The heat death tolls published in recent weeks by public health agencies in Belgium, France, Germany and the Netherlands relied on this approach.
(For more, see: What are the pros and cons of the ‘excess deaths’ method?)
The second method uses long-term mortality data to understand the statistical relationship between temperature and mortality in a given place. The model that emerges can be used to infer the number of deaths from a heatwave in that place.
In a rapid analysis published this week, researchers at Imperial College London, the London School of Hygiene and Tropical Medicine (LSHTM) and the Met Office used this approach to estimate that the May and June heatwaves in the UK caused the deaths of 2,700 people.
Dr Callahan – working with Prof Andrew Dessler, director of the Texas Center for Extreme Weather at Texas A&M University – used this method to estimate that more than 2,700 people had died in France over a 17-day period in June in an analysis for Carbon Brief.
(For more: see: What are the pros and cons of the ‘statistical modelling’ method?)
The majority of the figures released in the wake of Europe’s June heatwave have relied on these two methods.
There is a third way to calculate heat deaths, which is to look at official counts of deaths attributed on death certificates to heatstroke.
Callahan tells Carbon Brief that the “death-certificate coding” appears to have fallen out of favour in Europe – which he says is a “smart move” given that it does not provide a “full accounting”.
Nevertheless, some public health authorities are still using this method. For example, in the wake of the heatwave in the US earlier this month, public health data showed 29 people in New Jersey and three people in New York had died from “heat-related illnesses”.
Scientists tell Carbon Brief the excess deaths and statistical modelling approaches both have advantages and drawbacks. These are explored below.
What do the latest figures show for Europe’s May and June heatwaves?
The table below shows the death numbers that have been reported by governments and researchers for Europe’s May and June heatwaves, including the approach used to reach the figures.
It suggests that multiple countries in Europe experienced more than 1,000 heat-related deaths during the late June heatwave, with authorities in Germany counting more than 5,000.
Meanwhile, the EuroMoMo mortality monitoring system estimated there were more than 10,500 excess deaths across 27 countries during the June heatwave.
| Reported | Source | Country / region | Dates | Days | Deaths | Link | Approach |
|---|---|---|---|---|---|---|---|
| 28/06/2026 | Public Health France | France | 22-27 June | 6 | 1,000 | santepubliquefrance.fr | Excess deaths |
| 29/06/2026 | World Health Organization | Europe | 21-28 June | 8 | 1,300 | x.com/DrTedros/status | Excess deaths |
| 01/07/2026 | Carlos III Health Institute (MoMo) | Spain | 1-30 June | 30 | 1,033 | dw.com | Excess deaths (all-cause and temperature-attributable) |
| 02/07/2026 | National Institute for Public Health and the Environment | Netherlands | 22-28 June | 7 | 480 | rivm.nl | Excess deaths |
| 03/07/2026 | Public Health France | France | 22-28 June | 7 | 2,025 | santepubliquefrance.fr | Excess deaths |
| 07/07/2026 | Chris Callahan/Andrew Dessler | France | 12-29 June | 18 | 2,766 | carbonbrief.org | Statistical modelling |
| 08/07/2026 | Chris Callahan | Europe | 15-28 June | 14 | 13,975 | zenodo.org | Statistical modelling |
| 08/07/2026 | Sciensano | Belgium | 18 June – 1 July | 14 | 1,747 | brusselstimes.com | Excess deaths |
| 09/07/2026 | Robert Koch Institute | Germany | 22-28 June | 7 | 5,120 | rki.de | Statistical modelling |
| 13/07/2026 | Met Office/LSHTM/Imperial | England and Wales | 22-27 June | 6 | 2,183 | drive.google.com | Statistical modelling |
| 13/07/2026 | Met Office/LSHTM/Imperial | England and Wales | 24-26 May | 3 | 553 | drive.google.com | Statistical modelling |
| 13/07/2026 | EURO Mo/Mo | 27 European countries | 22-28 June | 7 | 10,650 | reuters.com | Excess deaths |
| 07/07/2025 | National Institute for Public Health and the Environment | Netherlands | 22-28 June | 7 | 577 | archive.ph | Excess deaths |
| 14/07/2026 | Germany Federal Statistical Office (Destatis) | Germany | 22-28 June | 7 | 5,753 | destatis.de | Excess deaths |
In most instances, Carbon Brief has linked to the figures published by public health authorities, where numbers were first reported. In some instances, figures were released on dashboards or webpages that are updated weekly. In these cases, Carbon Brief has linked to media reports or archived web content.
What are the pros and cons of the ‘excess deaths’ method?
The excess deaths approach looks at how many more people died during a particular time period compared to a baseline period of the same length.
For instance, on 14 July, Germany’s federal statistics agency, Destatis, published figures showing Germany saw 32% more deaths than the average in the week of 22-28 June, which was dominated by the heatwave.
Specifically, the agency said that 23,932 deaths had been recorded that week, compared to an average of 18,179 in that calendar week across the years 2022-25.
This suggests there were 5,753 excess deaths during the heatwave week. (This was a slight increase from preliminary Destatis figures released a week earlier, covered by Bloomberg.)
The Netherlands similarly calculates excess deaths by comparing death figures against an average of deaths in a similar period during unspecified “previous years”.
Data published by the country’s National Institute for Public Health and the Environment (RIVM) shows that, during the week of 22-28 June, an estimated 3,626 people died in total in the northern European country.
This is 577 more deaths than the 3,049 expected at that time of year, it said. (This is a slight revision upwards from the 480 excess deaths reported on 4 July by NL Times based on preliminary figures from NVIM.)
Callahan says that the excess deaths approach has the benefit of being rapid and relatively uncomplicated:
“It is something that public health authorities can put out fairly quickly without having to run a fancy model and do coding like the academic scientists do. It is a short-term, high-impact, rapid estimate of mortality.”
The drawback to the approach is that it is impossible to decipher what percentage of these “all-mortality” excess deaths are, in fact, heat-related.
Imperial College’s Konstantinoudis notes that the public often “feels more comfortable” with the excess deaths approach over the statistical modelling approach because the data it is using – the official death numbers – is based on real-world data.
However, he stresses that excess deaths figures are based on a series of assumptions, including the reference period picked by researchers and how the numbers are interpreted.
Statisticians and researchers have to make a series of decisions, including what period to use as a comparative baseline. For example, the baseline period could be the week before a heatwave, the same week a year before – or an average of the same week across multiple years in the past. If averaging mortality of a similar period across a number of previous years, they must decide how much “weight”, or influence, each year should have.
They must also decide how to account for spikes in deaths during the Covid-19 pandemic years, as well as the gradual rise in average temperatures due to global warming.
During the pandemic, many governments and the World Health Organization (WHO) used the excess deaths approach to count deaths. The WHO said this metric was more “comparable” and “objective” than relying on national reports of Covid-19 deaths, given that different countries used different criteria for this classification.
A notable example of how assumptions can skew excess death figures came during this period, when the WHO estimated in 2022 that Germany had seen 195,000 excess deaths over two years of pandemic.
However, after statisticians and epidemiologists pointed out the assumptions in the model were not suited to Germany’s demographics, the WHO retracted the figure and eventually reduced it to 122,000 and then later to 102,000.
Konstantinoudis explains:
“Covid taught us that it is complicated. Depending on the different assumptions used in the excess-mortality approach, you get different results…There is a scientific basis, but we should acknowledge the assumptions.”
What are the pros and cons of the ‘statistical modelling’ method?
In the statistical modelling approach, researchers use models to determine the specific relationship between mortality and temperature for a particular location and then apply it to temperatures observed during a heatwave.
This allows them to estimate the overall number of deaths that were caused by a heatwave.
Previous research has revealed that, in most places of the world, there is a U-shaped response of mortality to temperature – where deaths increase rapidly in cold or hot conditions as daily maximum temperatures depart further from an “optimum temperature”.
For example, research published in Proceedings of the National Academy of Sciences in 2025 found that mortality rates in France rise as daily maximum temperatures move away from approximately 20C. This is shown in the chart below.

Indiana University’s Callahan say this approach allows scientists to “formally establish a relationship between the temperature and the mortality”, adding:
“If you do these calculations right, you can credibly say your entire estimate of mortality is heat-related.”
Prof Antonio Gasparrini, biostatistician and epidemiologist at LSHTM, explains the method relies on “timeseries models that apply relatively sophisticated statistical methods in which you ‘smooth’ trends occurring in time, so you control for long-term trends and seasonality”.
He says that these models also allow researchers to “remove” trends affecting mortality that are unrelated to heat – for instance, the impacts of the pandemic. They can also “add” other information, such as around how air pollution combines with heat to threaten vulnerable populations.
Gasparrini adds:
“What statistical modelling can bring is that it is more refined. It can link specific temperatures to specific impacts rather than just looking at the event [in the whole]. And also, it can be localised – [data] can be stratified at a fine scale and we can look at impacts at different scales.
“So, it is more informative. But, at the same time, of course, it’s based on more assumptions than the [excess deaths approach] and, of course, needs to be checked and compared.”
The approach depends on a number of judgment calls from scientists and statisticians, including the years picked to underpin the model and how to capture the lag in deaths in the days and weeks after a heatwave event.
They must also decide at what threshold to start counting deaths – in other words, whether to count all deaths above the “optimum temperature” or set a higher, more extreme value – and whether and how to account for any adaptation to heat extremes that may have been put in place in the study area.
A benefit of the statistical modelling approach is that it opens the door for being able to attribute a specific number of deaths to human-caused climate change.
By applying the temperature-mortality curve to both the temperatures of the recent heatwave and a counterfactual world without climate change, scientists can estimate what proportion of estimated deaths only occurred because the world is warming.
For instance, Imperial College, LSHTM and Met Office researchers found that 59% and 38% of heat-related deaths in the UK’s May and June heatwaves, respectively, could be attributed to climate change. Their findings are shown in the chart below.

Some climate-sceptic commentators have argued that modelled estimates are hypotheses and should therefore be treated with caution.
On 13 July, climate-sceptic news website GB News covered a blog post by Oxford academics that argued the figure that 2,700 people had died in the UK’s May and June heatwaves was not reflected in the provisional “all-mortality” data put out by the UK’s Office for National Statistics (ONS). Quoting the blog, GB News said:
“Modelling tells us nothing. Models explore possibilities; surveillance tells us what happened. When the two disagree, our instinct should be to investigate the data rather than simply trust the model.”
However, Imperial’s Konstantinoudis – who worked on the models behind the 2,700 figure – says it is important to await the UK Health and Security Agency (UKHSA)’s annual heat mortality report before arriving at any conclusions. He explains:
“While we are entirely clear that our current findings are modelled estimates, this methodology has consistently delivered comparable results to the UKHSA’s own official analyses of observed deaths for past heat events.”
(The UKHSA report will include updated figures and estimate excess deaths from heat based on specific periods of heat in different regions, whereas the provisional ONS figures cover all national deaths during a full-week period.)
Konstantinoudis says both the excess deaths and statistical modelling approaches have been the subject of extensive peer-reviewed scientific study and can provide a “holistic view of what is happening” when used together.
Studies that have compared statistical modelling approaches for estimating heatwave deaths with excess death figures in the UK have found they yield broadly similar results.
The post Q&A: Europe’s May and June heatwave deaths – and how they were counted appeared first on Carbon Brief.
Q&A: Europe’s May and June heatwave deaths – and how they were counted
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