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Key developments
New documents ramp up pressure on coal
‘STRICTLY CONTROL’ FOSSIL FUELS: On 22 April, China issued a set of “guiding opinions” on energy conservation and carbon reduction that urged local governments to “strictly control fossil-fuel consumption”, according to the text published by state news agency Xinhua. Hu Min, director and co-founder of the the Beijing-based Institute for Global Decarbonization Progress, said in comments to Carbon Brief that the document was a clear signal of China’s political leaders’ desire to reduce the country’s coal usage and a “way to move things forward” until more specific policies are published. Government officials noted that the opinions are of “great significance for building broader and stronger consensus across society”, reported information platform Tanpaifang.
INCREASED OVERSIGHT: The next day, the government announced new evaluation criteria for judging provinces on their efforts to meet China’s climate goals, including on raising “clean-energy consumption” and limiting “use of coal and oil”, reported Bloomberg. The 14 indicators underscore China’s “key priorities” and encourage broader carbon reduction efforts, said energy news outlet China Energy Net. They build on China’s existing inspection system to create a “much stronger accountability and compliance system”, Qin Qi, China analyst at the Centre for Research on Energy and Clean Air, told Carbon Brief. For more detail see Carbon Brief’s Q&A on what the two policies mean for China’s energy transition.
‘RARE’ SIGNAL: Both documents were issued by the highest levels of the nation’s political system, which is “extremely rare” and “reflects the strategic importance” of China’s climate goals, Wu Hongjie, deputy secretary-general of the China Carbon Neutrality 50 Forum, told Jiemian News. In a comment article for finance news outlet Caixin, Chen Lihao – a member of the Jiusan Society, environment minister Huang’s political party – said the two documents “form the institutional foundation” for China’s “full-scale transition” to a “dual control of carbon” system.
Downpours in south China
‘RECORD-BREAKING’ RAIN: Heavy rainfall is hitting central and southern China, with Hunan, Guizhou and Jiangxi provinces reporting record-breaking levels of precipitation last week, reported the Communist party-affiliated People’s Daily. It added that the government is ramping up “flood control” measures in response. On 26-27 April, one part of Guangxi province received as much as 14cm of rain per hour, reported the state-supporting newspaper Global Times. Meanwhile, Chinese vice-premier Liu Guozhong met with the World Meteorological Organization secretary-general Celeste Saulo to discuss cooperation on global “meteorological governance”, said state news agency Xinhua, with the discussion touching on early warning systems and disaster relief.

EL NIÑO RISK: Officials at China’s National Climate Center (NCC) have said that an El Niño weather pattern is “likely to set in around May” and “intensify during the summer and autumn”, said China Daily. The state-run newspaper also quoted NCC chief forecaster Chen Lijuan saying it was “premature” to conclude that the El Niño could be at its strongest in 140 years, or that it could lead to record-breaking heat, although he added that the risks of such weather are “clearly increasing”. Wang Yaqi, a senior engineer at NCC, noted that the phenomenon “could hit hydropower-dependent regions hard, pushing them to burn more fossil fuels”, according to the Hong Kong-based South China Morning Post.
Solar capacity growth slows
CLEAN CAPACITY: China’s clean-energy grid capacity now exceeds 2,400 gigawatts (GW), as of March 2026, or 60% of the total power mix, said state broadcaster CGTN in coverage of comments from energy officials at a press conference. It added that, within this, total wind and solar capacity reached 1,900GW. Energy news outlet International Energy Net cited the officials saying that China’s operational capacity for “green hydrogen” stands at 250,000 tonnes, with another 900,000 tonnes under construction.
SOLAR SLOWS: However, a data release showed that China added 41GW of new solar capacity in the first three months of 2026, reported BJX News, down from 60GW of new capacity in January-March 2025. Bloomberg noted that new solar capacity additions “slowed sharply to hit a four-year low” in March, adding that wind and thermal capacity growth also both slowed.
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‘MOST AMBITIOUS GOAL’: In a separate press conference, Chinese officials confirmed to Bloomberg that a pledge in the 15th five-year plan to double “non-fossil energy” in 10 years referred to energy capacity – not generation or consumption – and would run from 2025-2035. These details were “unclear” in the five-year plan itself, the outlet added. The economic news outlet Economic Daily said that the doubling goal was “one of the most ambitious goals in China’s energy transition history”, adding that “accelerating” the energy transition would allow the country to both reduce its reliance on the international energy market and “seize the high ground in the global race” to develop low-carbon industries.
More China news
- NEW BLEND: China has begun a project to blend gas supplies with 10% hydrogen in a part of Shandong province, reported the South China Morning Post, which added that the shift could cut China’s annual carbon emissions by “roughly 30m tonnes”.
- SKY-HIGH: China launched a “high-precision” satellite to monitor greenhouse gas emissions, said Xinhua.
- SUNNY SPAIN: Chinese automaker SAIC plans to build an electric vehicle (EV) factory in Spain, reported Bloomberg.
- MING YANG: Bloomberg also said that wind turbine maker Ming Yang is considering Spain after plans for a factory in the UK were blocked.
- FORMAL COMPLAINT: China has “formally submitted a complaint” to the EU about its Industrial Accelerator Act, said China Daily.
- EU TARIFFS: China’s commerce minister said he reached a “soft landing” with EU officials on EU tariffs on imports of Chinese-made EVs, according to Reuters.
Spotlight
How war, silver and taxes propelled China’s cleantech exports
China’s export of clean-energy technologies surged in March, driven by a doubling in solar shipments, according to analysis by Carbon Brief of Chinese customs data.
The spike can be explained in part by the impact of the conflict in the Middle East, but analysts argue that a newly enacted solar export policy is also behind the figures.
In this issue, Carbon Brief explores the factors behind the export spike and whether or not it will be sustained.
China’s exports of the “new three” clean-energy technology surged by 70% year-on-year in March 2026, reaching $21.6bn, according to Carbon Brief analysis.
Exports of the three technologies – solar cells and panels, electric vehicles (EVs) and lithium-ion batteries – were also up 37% from February, the month before the Iran war.
The conflict in the Middle East is one explanation for the surge, as it has caused several countries to emphasise the need to increase non-fossil energy supplies.
However, there are also other important drivers, revealed by Carbon Brief analysis of customs data showing differences in exports between solar, EVs and batteries.
Solar exports were notably higher in March 2026 than in the previous two months, jumping 99.2% compared to February.
By contrast, neither batteries’ nor EVs’ March figures came close to the surge in solar cells.
China’s March exports of batteries rose 37% compared with the previous month, while month-on-month EV shipments increased just 1.4%.
(Figures from the China Passenger Car Association suggest a larger rise in percentage terms, but this is based on a narrower scope that does not capture all exports.)
This may be because both technologies saw strong export performance throughout the first quarter of 2026. According to the customs data, more than one million EVs were exported from China between January and March, up 73% compared with the same period last year.
These quarterly exports may have helped meet growing interest in EVs due to the conflict, with BloombergNEF estimating that sales of EVs rose to 1.1m – up 2% year-on-year – in March. (Bloomberg said, within this total, sales “cooled” in China and the US but “surged” in Europe and parts of Asia.)
Solar surge
The chart below shows the export volumes of solar cells, EVs and batteries in March 2025, plus the first three months of 2026.
March’s solar exports were capable of generating 68 gigawatts (GW), equivalent to Spain’s entire installed solar capacity, according to energy thinktank Ember.

The Ember analysis showed that 50 countries set all-time records for Chinese solar imports in March, with another 60 reaching their highest levels in six months.
Exports to Asia doubled to 39GW, while shipments to Africa surged 176% to 10GW. Combined, these two regions accounted for three-quarters of the overall increase in exports.
The Middle East conflict has boosted demand, but a domestic policy deadline was a more immediate driver, analysts told Carbon Brief.
The Chinese government removed export tax rebates for solar products on 1 April, prompting manufacturers to rush out shipments before the change took effect.
Qin Qi, China analyst at the Centre for Research on Energy and Clean Air, told Carbon Brief that such policy deadlines “can create a very sharp one-month jump in shipments”.
Batteries and EVs currently continue to receive export rebates.
Falling silver prices are another potential factor, as silver paste is used to make a key component in solar panels. The reversal of a recent price rally that had raised costs helped manufacturers make more panels ahead of the export switch, Marius Mordal Bakke, head of solar research at consultancy Rystad Energy told Reuters.
Temporary spike
Analysts predict that China’s April solar exports are unlikely to repeat March’s surge. Moreover, February exports were depressed by the Chinese New Year public holiday, making the March comparison unusually unfavourable.
“A month-on-month drop in April would not be surprising,” said Qin.
But she remains optimistic that global solar capacity additions outside China will continue to grow in 2026 due to energy supply concerns sparked by the Middle East conflict.
Dave Jones, chief analyst at Ember, said the removal of the export rebate will not “dramatically change demand”, especially as the conflict continues.
He argued that the policy could be positive, telling Carbon Brief: “This is what the global market needs: a more level playing field with China.”
This spotlight is by freelance China analyst Lekai Liu for Carbon Brief.
Watch, read, listen
TARGET ‘DIFFICULTIES’: Two researchers at the Energy Research Institute, a state thinktank, wrote in Economic Daily that China faces several “difficulties” in meeting its new carbon-intensity targets, including already-high renewable capacity installations and high levels of energy efficiency.
COMPARE AND CONTRAST: The US-China Podcast interviewed Prof Alex Wang on China’s approach to environmentalism and his view on the country’s energy transition.
GOVERNMENT CALLOUT: State broadcaster CCTV published a segment critiquing the massive investments and special treatment that local governments gave to their EV industries, fuelling intense competition.
‘THIN ARGUMENT’: A comment in Lawfare argued that the US should focus more on the “genuine geopolitical risks of climate change and [geoengineering] development”, rather than “thin” arguments around China weaponising weather modification technologies.
22.6%
The rate of “environmental health literacy” – or “recognition of the value of the ecological environment and its impact on health” – among China’s citizens, according to a government survey covered by Xinhua.
New science
- China will need to build more pipelines and push its carbon price above $100/tonne to make “green” ammonia a cost-competitive option for marine fuel | One Earth
- Carbon dioxide (CO2) emissions from China’s lakes increased from 41m tonnes to 51m tonnes of CO2 per year between 2000 and 2021, coinciding with “rapid lake expansion” across the country | Science Advances
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China Briefing is written by Anika Patel, with contributions from Lekai Liu, and edited by Simon Evans. Please send tips and feedback to china@carbonbrief.org
The post China Briefing 30 April 2026: Fossil fuel ‘strict controls’ | El Niño approaches | Why cleantech exports have surged appeared first on Carbon Brief.
Climate Change
Despite African walkout, fractious land COP ends without drought deal
The African continent’s hopes for a legally binding agreement to combat drought have been dashed again, as UN land restoration talks in Mongolia passed the issue onto the next set of talks in Egypt in two years’ time.
For over a decade, Africa has pushed for a UN protocol on drought risk management that would acknowledge drought as an issue requiring a regional and global – not just a national – response, potentially paving the way for more finance to help ensure water is available when drought hits.
A formal protocol would enable countries to transition from reacting to drought once it hits to “a proactive enabling mechanism to address drought and its effects such as migration”, said a Tunisian negotiator on behalf of the African Group of countries last week. Once land is regularly too dry and infertile to grow crops or graze animals, people often leave to seek a living elsewhere.
But this effort to adopt a protocol, led by Africa, has been resisted at successive land restoration COPs under the UN Convention to Combat Desertification (UNCCD), mainly by developed countries, which argue that a legally weaker alternative – a framework – would be faster and cheaper to set up.
Governments at the previous COP in Saudi Arabia in 2024 failed to reach agreement despite talks running past midnight, while this year’s saw African officials coordinate a walkout from negotiating rooms on Wednesday morning, according to two sources at the talks.
Drought deal delayed until 2028
The IISD’s Earth Negotiations Bulletin, a non-governmental organisation which unlike the media is allowed to watch and report on closed-door talks, said a call to suspend negotiations on Wednesday showed negotiations had reached “boiling point” and “made some jaws drop”.
Negotiations resumed after a lunchtime meeting with the Mongolian COP presidency although governments were only eventually able to agree that they could not find consensus in Ulaanbaatar and should resume talks on an instrument to deal with drought in 2028.
Christine Colvin, WWF’s head of freshwater policy, told Climate Home News that, with droughts hitting from Honduras to the English region of Hampshire, something concrete – whether a protocol or a framework – is needed urgently “rather than the can being kicked down the road for another two years as will now happen with the protocol procrastination”.

But, in a closing press conference on Friday, the Mongolian minister presiding over talks celebrated that governments had reached consensus on several “contentious” issues and that agenda items blocked at this year’s COP17 would be put on the agenda for COP18 in Egypt.
US blocks agenda items
Other agenda items that divided countries were on measuring land degradation’s effects on women, enhancing the involvement of civil society and women in land COPs, and the UNCCD working more closely and effectively with the UN’s climate and nature conventions.
On the COP’s opening day two weeks ago, the US representative said the Trump government objects to these agenda items “on their premise and no amount of negotiation will allow us to join consensus on these items. As such we request that they be struck from the agenda at which time we will then be able to approve it, saving us valuable negotiating time.”
A US State Department spokesperson later told Climate Home News that the US wants the UN “to get back to basics by refocusing on its core mandate, eliminating overlap, and reducing competition for scarce resources”.
The spokesperson added, “that means prioritising the concrete work member states created [the UN] to do – rather than diverting limited time, attention, and resources toward social and political agendas, including gender-related initiatives.”

On COP’s first day, the European Union and Brazil pushed back against the blocking of these agenda items, with a Brazilian negotiator saying his country attaches “great importance” to them. But the Mongolian presidency directed governments to adopt the rest of the agenda without the controversial items, which were discussed privately with countries throughout the two weeks.
An EU statement, read out later by Irish minister Timmy Dooley, accused “some parties” (meaning national governments) of having adopted a “less constructive approach” and preventing “discussions on important matters from even commencing”.
The agenda items the US refused to engage with were never discussed and were only placed onto the agenda for the next COP on the last day. Those talks will take place in Egypt in two years’ time, with Donald Trump due then to be in his last year as US president.
No restoration without women
The blocking of the gender agenda item has stymied attempts, agreed on by governments at the last COP, to develop gender-specific indicators for the UNCCD’s next overall framework and to facilitate more women delegates at COPs. Women made up only about a quarter of delegates to COP15 in 2022, UNCCD analysis with the latest data shows
Criticising the move to keep gender off the agenda, the EU said in a statement that it welcomes “the attention being given at COP17 to women pastoralists and herders, recognising their contribution to sustainable land management and resilient rural livelihoods”.
The head of the UNCCD, former Egyptian environment minister Yasmine Fouad, said on Friday that “regardless that the agenda item was blocked”, she was proud that she and COP17 President Batmunkh Battsetseg had led the COP as women and attended the gender caucus (a meeting of groups supporting women at the talks).

“Without the women,” she told the closing press conference on Friday, “we will not be able to restore land, restore hope, restore life or restore even our children and grandchildren. And we will keep on pushing that agenda.”
The civil society agenda item aimed to allow NGOs to attend land COP negotiations, as they do at climate COPs, and included terms of reference for an Indigenous Peoples Caucus.
A representative of Indigenous Peoples told the COP’s closing plenary meeting that the group had “deep disappointment that the agenda of this COP has removed the dedicated space for indigenous peoples”. “We cannot restore the land while removing the voices of those who care for it,” she said.
On Tuesday, the UNCCD’s deputy head Andrea Meza was asked about Indigenous Peoples’ participation. She said that the blocking of “one agenda item” is “generating uncertainty in the progress” towards creating caucuses for Indigenous Peoples and for Local Communities within the talks.
Because of the “complex geopolitical situation” making it hard to obtain consensus, coalitions of the willing have become more important, she added.
Mining out, money in
Outside the formal negotiations, the summit was marked by a focus on the strongly Mongolian issues of the role played by pastoralists and rangelands like grasslands, as well as mining, in both degrading and restoring land.
Part of the conference was sponsored by Australian mining company Rio Tinto and its local partner Oyu Tolgoi. Their presence was protested by campaigners wearing T-shirts calling on the companies to “stop wasting drinking water” and to “get out of Mongolia”.

The UNCDD and others praised the success of the summit in raising more finance for land restoration. The COP saw institutions like the Asian Development Bank and Global Environment Facility pledge money to combat land degradation, with the UNCCD estimating that $645 million of new commitments were made.
An estimated $355 billion a year is needed through 2030 to meet global land restoration commitments, compared with around $77 billion currently invested. Private finance accounts for only around 6% of global investment, according to the UNCCD.
UNCCD chief scientist Baron Orr told a press conference that many of the announcements were public-private partnerships that use government money to “even the playing field” for companies that want to protect land, in a bid to ensure they are not disadvantaged compared with those that do not.
Such partnerships are a “huge opportunity”, he said, especially as “we’re not in a moment of public finance – public finance is tight in every country.”
The post Despite African walkout, fractious land COP ends without drought deal appeared first on Climate Home News.
Despite African walkout, fractious land COP ends without drought deal
Climate Change
Pacific islands seek backing for new regional fund ahead of COP31
Burdened by rising fuel import costs and an “ocean crisis” of record-breaking heat, Pacific island nations are seeking to build support for a new regional fund ahead of COP31, intended to channel investment into renewable energy, community resilience and ocean protection, experts said.
Leaders from the 18-member Pacific Islands Forum (PIF), including Australia and New Zealand, are expected to issue a call for global pledges to the Pacific Resilience Facility (PRF) at a high-level meeting this coming week in Palau, seeking to build a new model for financing climate action.
The new regional fund was formally launched in May this year and is meant to “serve communities at a community level”, swiftly channelling investments for their projects on the ground, according to Fiji’s assistant minister for foreign affairs, Lenora Qereqeretabua.
“We are expecting pledges for the PRF, and these funds will go to communities that apply,” she told journalists at an online briefing. “We have organised it in such a way that it makes our application processes much, much easier than applying for global funding.”
Qereqeretabua added that she expects that PRF funds will be “utilised by communities to protect themselves from climate change and the effects of climate change.”
The Pacific Islands Forum meeting is expected to shape the region’s priorities ahead of this year’s pre-COP, hosted by Fiji and Tuvalu, and COP31, which will be co-led by Australia and Türkiye.
At COP31, a dedicated session on the climate finance needs of small island states will seek to drive pledges into the PRF. The fund has so far received about $172 million in capital – with about $67 million coming from Australia – and aims to close the year with $500 million.
Ocean heat and fossil fuel shocks
Leaders from the Pacific will meet in Palau from Sunday amid an “ocean crisis” of record-breaking ocean heat caused by this year’s “super El Niño”, according to Kevin Chand, Pacific ocean policy director at National Geographic’s Pristine Seas conservation project.
Leaders at the PIF are expected to put forward commitments towards new marine protected areas, which will be key for shielding ecosystems from future climate extremes, Chand said. The forum is expected to issue a statement on the need for ocean action at COP31, and announce commitments towards reaching the global goal of protecting 30% of the planet’s land and sea ecosystems by 2030.
Rising ocean heat could lead to food insecurity and lost government earnings in the region, as key fish stocks like tuna start migrating away from their coastline in search of colder waters, said Coral Pasisi, director of climate change and sustainability at the Pacific Community (SPC).
Climate shocks are deepening existing economic pressures, as Pacific nations have spent up to a quarter of their GDP on fossil fuel imports due to the war in Iran, according to a recent report by the University of New South Wales (UNSW) in Australia.
Wesley Morgan, one of the study’s authors, told journalists that partner nations “ought to be putting their money where their mouth is”, and should support the energy transition in the Pacific by covering the upfront costs of switching from polluting diesel to solar power, batteries and electricity grid upgrades.
China keeps Indonesia’s battery dream afloat but future less certain
Given the increase in climate-related shocks and sea-level rise, the PIF should also mention the need to phase out fossil fuel extraction and consumption, said Sindra Sharma, international policy lead at the Pacific Islands Climate Action Network (PICAN).
Last year’s COP30 failed to deliver a global roadmap on transitioning away from fossil fuels, which led to a group of countries – including several Pacific island nations – pursuing their own fossil fuel phase-out summit in Santa Marta, Colombia. Next year’s conference will be hosted by Tuvalu and co-chaired by Ireland, which should also receive backing from the PIF, Sharma said.
Both the chairs of the Santa Marta coalition and the Australian COP31 co-presidency have vowed to continue a push for this topic to be discussed at COP31.

New fund to test allies
As local communities in the Pacific struggle to access global climate funds, the PRF’s planned model for quick, direct disbursements has “very solid and good” intentions, Sharma said, but it will need political and financial backing from donor countries.
“The proof is going to be when the fund actually starts operating and delivering to communities,” she added. “If there is too much bureaucracy in being able to access the funds, for example. These things will have to be scrutinised.”
The facility aims to deliver funds in two categories: one for climate adaptation and “disaster resilience”, and another for social and community resilience that includes areas like community capacity-building, education, data analytics and financial management, among others. It will launch its first call for proposals at the PIF.
Morgan added that Australia will need to “leverage global interests” so that funding is directed to the Pacific Resilience Facility “or else the Pacific won’t be able to trust Australia as a partner”. The country ratified the PRF treaty in May, triggering its entry into force.
“The perception [of Australia] in the region is genuinely divided, and it’s worth being honest about it,” Sharma said, adding that the pre-COP31 in Fiji, which is usually limited to a technical space for negotiations, will determine how meaningful Australia’s advocacy for the Pacific can be.
This time, Pacific nations want to use the pre-COP in early October as an opportunity to demonstrate the challenges their largely low-lying islands face and to advocate for their political priorities, including a renewed global effort to limit global warming to 1.5C by cutting emissions faster and deeper. World leaders are due to visit Tuvalu to experience the frontline of rising sea levels, although Australia and Fiji have yet to confirm who will attend.
“In Bonn, Australia was largely missing on the negotiated outcomes that we so urgently need to see. It’s not enough to get Pacific priorities on the agenda. Agenda placement is not delivery,” Sharma added.
The post Pacific islands seek backing for new regional fund ahead of COP31 appeared first on Climate Home News.
Pacific islands seek backing for new regional fund ahead of COP31
Climate Change
Climate change exposes 580 million children to 20 extra ‘heat-stress days’ every year
More than 40% of children under the age of 10 globally are already experiencing at least 20 additional “heat-stress days” due to climate change.
This is according to a new attribution study, published in Science Advances, which combines climate models with demographic data to assess the age groups and regions that are exposed to the most hot, humid days.
The study finds that children up to the age of nine already face more additional heat-stress days globally as a result of climate change than any other age group.
It adds that south Asia and west Africa are recording the greatest childhood exposure to dangerous levels of humid heat – largely because these regions have a rapidly growing population with the highest proportion of young children.
As the climate warms, children will continue to be more exposed to heat stress than any other age group, the paper warns.
The lead author of the study tells Carbon Brief that the findings should inform discussions about climate justice, noting that children in developing countries “have contributed the least to historical greenhouse gas emissions”.
Humid heat
High temperatures can be deadly. For example, the heatwaves that swept across Europe in the summer of 2026 have been linked to tens of thousands of “excess deaths”.
A prominent 2021 study found that children born in the 21st century will be exposed to more extreme weather events in their lifetimes than their parents and grandparents.
Four years later, a study conducted by scientists from the same team found that more than half of children born in 2020 – around 62 million people – will experience “unprecedented lifetime exposure” to heatwaves, even if warming is limited to 1.5C.
Now, the latest research from the same team finds that children already face greater exposure to dangerous levels of humid heat than adults as a result of human-caused climate change.
Extreme heat is particularly dangerous when combined with high humidity. In hot weather, the human body produces sweat to cool itself down. However, as humidity increases, sweating becomes less effective.
The study uses wet-bulb globe temperature – a measure of temperature that takes humidity and wind into account – to calculate heat stress. It defines a “heat-stress day” as any day with a wet-bulb globe temperature above 28C, as this is considered the threshold for “moderate heat stress”
The authors then use climate models to simulate global temperature patterns in the present-day climate. (The authors use the climate of 2023, in which human activity has caused 1.3C of warming, to represent the “present-day”.)
They then count the number of heat-stress days that each country records on average, per year. The authors then repeat this exercise, simulating a pre-industrial climate without human-caused warming.
By comparing the number of heat-stress days in the present-day climate with the number in a pre-industrial climate, the authors can determine how many extra heat-stress days were driven by climate change. They refer to these as “extra” or “attributable” heat-stress days.
The authors find that “low-latitude” countries, located in the tropics, record the most extra heat-stress days.
For example, the paper finds that people living in Côte d’Ivoire currently face 112 heat-stress days every year. It adds that around half of these are due to human-caused climate change.
In contrast, Germany sees only 0.1 heat-stress days per year in today’s climate on average, which is largely attributable to human-caused climate change.
Rosa Pietroiusti, a PhD student at Vrije Universiteit Brussel and lead author on the study, explains why this number may seem lower than expected.
She tells Carbon Brief that the paper “really focuses on humid heat, at levels that are relatively rarely felt in Europe”. She adds:
“Our data also doesn’t capture the urban heat island effect, due to the resolution of the data we use, which also would lead to underestimations of heat stress locally, and lead to a mismatch with what people are experiencing at local scales, particularly in cities.”
Inequality
Extreme heat affects some people more severely than others. Children, people over 65 and those with pre-existing medical conditions or certain disabilities are among the most vulnerable. This is because their bodies are less able to regulate their temperature.
The authors use gridded demographic data to determine the age structure of each country. From this, they calculate how many people from each age cohort are exposed to extra heat days as a result of climate change.
The research finds that globally, 583 million children under the age of 10 already live through at least 20 attributable heat days every year. This accounts for 44% of all children in this age bracket.
In comparison, 190 million people aged 60-69 face at least 20 attributable heat days per year, accounting for 30% of this age cohort.
The authors find that children face the greatest exposure to humid heat for two main reasons.
First, there are more young people alive today than older people, with 1.3 billion children aged under 10 in the world, compared to 0.6 billion people aged 60-69.
Second, they find that countries in Africa and Asia typically have rapidly growing populations with more young children. In contrast, many countries in the northern hemisphere – which are typically cooler – have older populations.
The map below shows how many extra stress heat days each country currently faces as a result of human-caused climate change. Darker reds indicate a higher number of attributable heat days. The blue circles show the percentage of the population under the age of 10, with larger circles indicating a higher percentage.

Warming world
The authors also repeat their analysis for a 1.5C and 2C warmer world. They use population estimates from the SSP2 scenario, which projects that the world’s population will peak at more than nine billion in the second half of the 21st century, with most growth occurring in low-latitude regions – especially in sub-Saharan Africa.
The research finds that, in today’s climate, 11% of all under 10s currently experience 100 or more extra heat-stress days per year due to climate change. In worlds warmed by 1.5C and 2C, the percentage rises to 13% and 23%, respectively.
In contrast, only 6% of all people aged 60-69 currently face 100 or more extra heat-stress days each year due to climate change. This number rises to 9% and 17% for 1.5C and 2C worlds, respectively.
These results are shown in the plot below. The three rows represent the climates of 2023 (top), a 1.5C world (middle) and a 2C world (bottom). The columns show different age cohorts, from the oldest on the left to the youngest on the right.
Each circle contains 100 coloured dots, with each dot representing 1% of the age cohort.
The colour of the dot represents exposure to annual heat-stress day, with darker dots indicating more heat-stress days. Grey dots mean that people experience fewer than one extra heat-stress day per year due to human-caused climate change, while black dots mean more than 150 extra heat-stress days due to climate change.
The figure shows that higher warming levels expose more people to heat stress and that younger cohorts tend to be worst affected.
For example, the top-right circle represents heat stress for under 10s in the present-day climate. Three of these dots are coloured black, indicating that 3% faced at least 150 attributable heat-stress days in 2023.

Pietroiusti tells Carbon Brief the study uses wet-bulb temperature because it is a “well-established heat stress metric”. However, she notes that it was not “explicitly defined to focus on children”. She continues:
“A really important step forward in the research community would be to link up climate science and health science experts to do research on what metrics are really most representative of, for example, health impacts and educational impacts that children will be suffering.”
Vulnerability
Dr Qinqin Kong, a postdoctoral researcher at the departments of medicine and health policy at Stanford University, who was not involved in the study, praises its “robust” methodology.
He tells Carbon Brief that the research provides “a timely quantitative evidence for discussions of climate justice, children’s rights and intergenerational equity”.
However, Kong suggests that the paper “may overstate the contrast between children and the elderly and underestimate the relative burden of older adults”.
He says:
“The elderly may also be more vulnerable due to their social circumstances. Children often benefit from parental supervision and caregiving, whereas many older adults live alone, have limited mobility and face barriers to accessing cooling or emergency assistance during heat events.”
Kong also notes that “people and societies in the mid-latitudes [for example, across much of Europe and North America] are less adapted to heat”, which may make them vulnerable to its impacts.
For example, he says that Europe “shows substantially stronger relative risk of heat mortality likely due to less heat-acclimatised populations, lower air conditioning prevalence and urban designs that don’t favour heat dissipation”.
Similarly, Dr Daniel Vecellio – a researcher at the University of Nebraska, who was not involved in the study – tells Carbon Brief that children are an “understudied cohort”.
However, he says there is “reason for hope” because “children are typically pretty good behavioural adapters to extreme heat” and because people who are “chronically exposed to extreme heat” will “have a better chance at better acclimatisation”.
Pietroiusti tells Carbon Brief that global reporting on heatwaves is often skewed towards wealthier nations.
For example, she notes that large-scale databases of disasters, such as EM-DAT, often underrepresent heatwaves in Africa, due in part to a lack of news coverage and formal reporting. She adds:
“Studies like this, which start from the climate data, can start to fill some of these gaps.”
She adds that the paper should inform discussions about climate justice, noting that children in developing countries, who are most severely affected by the increase in heat-stress days, “have contributed the least to historical greenhouse gas emissions”.
Pietroiusti, R. et al. (2026) Age-specific exposure to human-induced increases in humid heat, Science Advances, doi:10.1126/sciadv.aeb3232
The post Climate change exposes 580 million children to 20 extra ‘heat-stress days’ every year appeared first on Carbon Brief.
Climate change exposes 580 million children to 20 extra ‘heat-stress days’ every year
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