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We handpick and explain the most important stories at the intersection of climate, land, food and nature over the past fortnight.

This is an online version of Carbon Brief’s fortnightly Cropped email newsletter. Subscribe for free here. This is the last edition of Cropped for 2025. The newsletter will return on 14 January 2026.

Key developments

UN talks face headwinds

GLOBAL OUTLOOK: A major new report calling for joint action on climate change and biodiversity was published this month at the UN Environment Assembly talks in Nairobi, Kenya, the Associated Press reported. The newswire said that more than 300 scientists from 83 countries contributed to the latest UN Environment Programme (UNEP) global environment outlook report.

‘SHARP DIVISIONS’: However, for the first time ever, countries failed to agree on a “summary for policymakers” to be published alongside the outlook, according to Agence France-Presse. It said that “sharp divisions” prevented countries reaching consensus on the high-level political summary, with “major oil producers Saudi Arabia and the US oppos[ing] references to phasing out fossil fuels”. The newswire added that UNEP chief Inger Andersen called the lack of a summary “regrettable”, but said the “integrity of the report” remained.

NEW AGREEMENTS: Separate to the report, negotiators in Nairobi were also tasked with agreeing on 15 resolutions and two decisions on a wide range of environmental topics, from plastics to the impact of artificial intelligence, forcing them to “work throughout the day and into the night” towards the end of the summit, according to the Earth Negotiations Bulletin (ENB). In the end, countries adopted 11 resolutions, including on protecting coral reefs from climate change, the global management of wildfires and the preservation of glaciers, a second ENB report said.

TURKISH INFLUENCE: Climate Home News reported that Turkey, the country co-hosting the COP31 climate summit next year alongside Australia, “sought to weaken language on climate change in several draft resolutions” being discussed at the talks. The publication said that the nation, often working alongside Saudi Arabia, “pushed to dilute wording on the climate crisis, the science of melting glaciers and the role of young and Indigenous people”. A separate Climate Home News story said that countries agreed to a first-of-its-kind resolution on addressing the environmental effects of AI, but failed to include a reference to examining its “life cycle” impacts.

‘Deadly’ Asia floods

‘NOT NORMAL’: Climate change made the rainfall behind the “deadly” floods and landslides in parts of south Asia earlier this month more likely to occur and more intense, a World Weather Attribution study covered by the Hindustan Times found. Deforestation and rapid urbanisation also contributed to the extreme flooding that killed more than 1,600 people in several countries, including Sri Lanka, Malaysia and Thailand, the newspaper said. The Guardian noted that while monsoon rains often bring flooding, scientists said this level of intensity was “not normal”.

FOREST LOSS: Mongabay looked at how deforestation contributed to the “catastrophic” impacts from Cyclone Senyar, which caused floods and landslides in Sumatra, Indonesia. The outlet said that “decades of deforestation, mining, plantations and peat drainage left watersheds unable to absorb intense rainfall”. Indonesian environmental group WALHI told the Associated Press that deforestation “stripped away natural defences that once absorbed rainfall and stabilised soil”. Gus Irawan Pasaribu, a local government leader in Tapanuli, told Reuters: “If our forests were well-preserved…it would not have been this terrible.”

NATURE IMPACTS: A separate Mongabay article reported on the “extensive” damage caused by Cyclone Ditwah to Sri Lanka’s “biodiversity-rich” central highlands earlier this month. The outlet said that initial assessments have shown disastrous impacts of flooding and landslides in places such as the Knuckles mountain range, a “Unesco-listed biodiversity hotspot”. Meanwhile, the floods that hit Indonesia were an “extinction-level disturbance” for the Tapanuli orangutan – the world’s rarest great ape, scientists told the Guardian.

Spotlight

Building a bird sanctuary at a London reservoir

In this Spotlight, Carbon Brief visits a radical conservation project aiming to reverse a decline in water birds at a Victorian reservoir in north London.

“I’d recommend bringing wellies! It’s very muddy.”

Those were the instructions of Ben MacMillan, an ecologist at the Canal & River Trust, a charity responsible for looking after the UK’s waterways, including canals, reservoirs and towpaths.

On a damp and grey Tuesday morning, he guided Carbon Brief round the back of a playing fields car park in Hendon, north London, past a metal fence reading “no entry” and across ground covered by several inches of mud to the unlikely site of a radical new conservation effort.

The site is at a degraded wetlands on the northern edge of the Welsh Harp reservoir, a large human-made lake capable of holding 400 Olympic-sized swimming pools of water, first established by the Victorians in the 1830s.

In the 1950s, the reservoir was declared one of the UK’s “sites of special scientific interest”, due to its ability to host an unusually large number of species, including breeding waterbirds, such as silvery-grey common terns and elegant great-crested grebes.

Despite the designation, little was done to protect the site from various threats, including the spread of invasive species, increasing urbanisation and pollution from major roads. The reservoir is bordered on one side by the M1, the main motorway from London to northern England, and by the North Circular, part of central London’s busy ring-road, on another.

In the 1980s, a conservation project led by ecologist Leo Batten transformed the site to create new refuges for breeding birds.

However, for the past 40 years, the reservoir has fallen into “mismanagement”, according to MacMillan – with devastating consequences for its wildlife.

In 2022, just two tern chicks were successfully fledged at the reservoir, compared to 44 in 2000, MacMillan said. Great-crested grebe nests have also dropped from 55 in 1987 to 27 in 2022.

Redesigning the landscape

The dramatic decline has spurred the start of a new £400m restoration project, called “wings on water”, which began in October 2025 and will continue for the next three years.

Headed by MacMillan, the project is making radical changes to the landscape of the site in order to create new habitats and breeding spots for its water birds.

MacMillan has contracted the services of restoration specialists Ebsford Environmental, who have used diggers to create a network of channels across the site.

Channels dug for wildlife at the Welsh Harp reservoir in London. Credit: Ben MacMillan
Channels dug for wildlife at the Welsh Harp reservoir in London. Credit: Ben MacMillan

These channels have uncovered a series of islands that can offer birds a safe place to breed, away from predators such as urban foxes and mink, MacMillan said.

As well as dredging the landscape, MacMillan also plans to introduce new micro-ecosystems, such as wildflower meadows, that will eventually form a “patchwork” capable of supporting a wide range of species.

“It’s all about creating a diversity of habitat,” he said. “It might take five or 10 years to develop, but eventually we’ll end up with an amazing complex mosaic of habitats.”

While MacMillan is “very happy” with the progress being made, the project has some issues to contend with.

One of the recently dug channels is contaminated by toxic silt, poisoned by the runoff of petrol from the nearby major roads. If the petrol seeps out of the silt, it could coat the feathers of birds, negatively affecting their health, MacMillan said.

Ninja turtle legacy

The site is also home to a number of invasive species, each with their own impacts.

One animal causing a particular nuisance are red-eared terrapins, a type of omnivorous shelled reptile, similar in appearance to a turtle, that are native to the US.

“They link back to the 1990s Teenage Mutant Ninja Turtle craze,” MacMillan explained. “People bought loads of them. Then they thought: ‘Oh, these are getting a bit big now’ – and decided to release them in their local park.”

Terrapins have a life span of around 40 years, meaning many released on a whim 30 years ago have now established themselves in waterway habitats across the UK.

While terrapins feed on plants, they have also been seen taking chicks and eggs from nesting birds, MacMillan said:

“In an ideal world, we would move them on. But in practice, it’s very difficult to actually catch them.”

As well as restoring the site for the good of birds, the project also aims to improve access to nature for the local community.

The team plans to install a new boardwalk and viewing platform for the public, which they aim to open next year.

“It should provide a really nice space for people to take a walk in a green space, while being able to spot some breeding birds, in a very urbanised area,” MacMillan said.

News and views

NATURE CASH: The ‘Cali Fund’ – which could generate billions of dollars each year for conservation – recently received its first donation of just $1,000, Carbon Brief reported. On 19 November, nine months after the fund launched, UK start-up TierraViva AI put forward the contribution. The company’s chief executive told Carbon Brief that this was an “ice-breaker” aimed to encourage others to pay in. One expert described the contribution as a good “first step”, but said it is now “time for larger actors to step forward”. Large companies in sectors such as pharmaceutical, cosmetic, biotechnology, agribusiness and technology could contribute to the fund.

FARMING LOSSES: UK crop farmers lost more than £800m in 2025 due to poor harvests and “record heat and drought”, the Guardian reported, based on analysis from the Energy and Climate Intelligence Unit (ECIU). Farmers recorded one of the worst harvests on record this year, with production of wheat, oats, spring and winter barley and oilseed rape dropping 20% below the 10-year average. Three of the five worst harvests have occurred since 2020, the newspaper added, quoting the ECIU’s Tom Lancaster: “The evidence suggests that climate impacts are what’s actually driving issues of profitability.” Meanwhile, BBC News reported that the UK government “roll[ed] back” certain nature protection requirements for housing developers in England.

CLIMATE FINANCE: Biodiversity, conservation and anti-desertification programmes in Africa have struggled to fill a “funding vacuum” since the US froze its development aid earlier this year, according to Mongabay. Experts and observers told the outlet they are “increasingly concerned” about the funding gap that “neither Europe nor billionaire philanthropists seem ready to fill”. Amhed Moustapha Mfokeu, a Cameroonian expert in climate finance, told Mongabay that the closure of the US Agency for International Development (USAID) “created a significant gap in funding for climate-related projects”.

SAVING SOILS: Around 70% of countries do not prioritise soil restoration in their national climate plans, a new report covered by EFEVerde found. The report, from the International Union for the Conservation of Nature’s world commission on environmental law and other groups, said that healthier soils can absorb more carbon and help to limit global warming, the outlet noted. Praveena Sridhar from the Save Soil movement wrote in Earth.org that the recent COP30 climate talks in Brazil “regarded [soils] as a sub-component of the agricultural machine, instead of the foundation to agriculture and many other components of terrestrial life”.

TRADE DEAL: The European parliament voted in favour of including measures to “protect European farmers” in a potential trade deal with South American countries, Bloomberg reported. The outlet said the EU is “rushing” this week to finalise the Mercosur deal, which has been negotiated over the past 25 years and aims to boost trade between the EU and Argentina, Brazil, Uruguay and Paraguay. Reuters reported that France and Italy want to delay the vote, with France trying to “form a blocking minority” against the agreement.

XMAS CHEER: Christmas tree farmers in Canada are adapting to climate change impacts such as warmer weather, CBC News reported. Michael Cormack, who owns a tree farm near Toronto, told the outlet: “This year in July, we were averaging over 29C. So we had trees from two to three years ago that just died…Four years ago, we had a tornado here that wiped out a bunch of our stuff.” The outlet also addressed the age-old question of whether a real or artificial christmas tree is more “eco-friendly”, with one tree researcher saying that a real tree bought from a “local farmer” tends to be a lower-emission choice, or re-using an artificial tree for a long time.

Watch, read, listen

KOLAHOI GLACIER: A retreating glacier in Kashmir is “transforming landscapes and communities”, the Guardian said.

FISHY: DeSmog investigated accusations that the world’s largest salmon producer has wielded a “charm offensive” in the Scottish Highlands to distract from its “noisy” and “polluting” fish farms.

LIVING UNDER THREAT: The Associated Press reported on the “steep risks” environmental activists face in Colombia – the “deadliest country in the world” for environmental defenders.

BAMBOO BARRIER: Rivercane – a species of bamboo – could help protect the southern US from future floods, Grist reported.

New science

In the diary

Cropped is researched and written by Dr Giuliana Viglione, Aruna Chandrasekhar, Daisy Dunne, Orla Dwyer and Yanine Quiroz. Ayesha Tandon also contributed to this issue. Please send tips and feedback to cropped@carbonbrief.org

The post Cropped 17 December 2025: ‘Deadly’ Asia floods; Boosting London’s water birds; UN headwinds appeared first on Carbon Brief.

Cropped 17 December 2025: ‘Deadly’ Asia floods; Boosting London’s water birds; UN headwinds

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Climate Change

Despite African walkout, fractious land COP ends without drought deal

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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.

A traditional Mongolian Ger tent at COP17 (Photo: Anastasia Rodopolou/IISD ENB)

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”.

Negotiators talk at COP17 (Photo: Anastasia Rodopolou/IISD ENB)

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.”

A protester calls for Indigenous Peoples, local communities, women and youth to be on the agenda of COP17 (Photo: Anastasia Rodopoulou/IISD ENB)

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).

Yasmine Fouad and Batmunkh Battsetseg talk at the COP17 closing press conference (Photo: Kiara Worth/UNCCD)

“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”.

A campaigner protests at COP17 on Thursday (Photo by IISD/ENB | Anastasia Rodopoulou)

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

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Pacific islands seek backing for new regional fund ahead of COP31

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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.

    A drought response brigade in Tuvalu in 2020
    A drought response brigade in Tuvalu in 2020. (Photo: Pacific Community)

    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.

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    Climate Change

    Climate change exposes 580 million children to 20 extra ‘heat-stress days’ every year

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    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.

    Map of the world showing the number of extra heat days faced by the global population at present-day warming levels as a result of human-caused climate change. Source: Pietroiusti et al (2026).
    The number of extra heat days faced by the global population at present-day warming levels as a result of human-caused climate change. Source: Pietroiusti et al (2026).

    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.

    Attributable days of heat stress for different age cohorts (columns), at different warming levels (rows). Each circle contains 100 coloured dots, with each dot representing 1% of the age cohort. Darker dots indicate more heat-stress days. Source: Pietroiusti et al (2026).
    Attributable days of heat stress for different age cohorts (columns), at different warming levels (rows). Each circle contains 100 coloured dots, with each dot representing 1% of the age cohort. Darker dots indicate more heat-stress days. Source: Pietroiusti et al (2026).

    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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