Welcome to Carbon Brief’s Cropped.
We handpick and explain the most important stories at the intersection of climate, land, food and nature over the past fortnight.
This is an online version of Carbon Brief’s fortnightly Cropped email newsletter.
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On Monday 4 November 2024, Carbon Brief will be hosting two webinars – one in English and one in Spanish – where we will be unpacking all of the details and decisions from COP16.
Key developments
Millions versus billions
FINANCE FIGHT: Resource mobilisation continues to be one of the most divisive negotiation topics at COP16, which provides the first litmus test for how developed countries have progressed on their finance commitments since Montreal. Pledges made so far have been far short of closing the $700bn-a-year finance gap for biodiversity. In a non-paper compiling countries’ views on a new resource mobilisation strategy for 2025-30, developing countries revived their call for a new financial mechanism under the COP, which is opposed by developed countries. The new fund “could become the biggest issue for debate” at the talks, Climate Home News reported. COP16 president Colombia’s attempt to include references to the global debt crisis have also faced marked opposition. The one point of consensus, however, is to mobilise funds for nature from “all sources”.
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ALL SOURCES GO?: Attempts to thaw the finance deadlock began right from the start of COP, chiefly through private and hybrid finance initiatives. The International Advisory Panel on Biodiversity Credits launched its “high-integrity” principles for biodiversity markets, which were called “extremely problematic” by the Green Finance Observatory, a sustainable finance thinktank. The Brazil-led Tropical Forests Finance Facility (TFFF) took centre stage on “finance day” at COP16. The fund aims to raise $125bn for six rainforest nations through re-investing long-term loans from developed countries. Seven countries, including New Zealand, France and Austria, as well as Quebec, pledged $163m in total to the Global Biodiversity Framework Fund. “We are talking about millions that have been pledged…But what we are expecting are billions,” Irène Wabiwa Betoko from Greenpeace told Reuters. Other observers told Carbon Brief that “at least this $163m is grant money and not loans”.
OCEAN ACTION: On 23 October, Panama ratified the “High Seas Treaty”, bringing the total number of ratifications to 14 out of the 60 that are required for the treaty to enter into force, according to the High Seas Alliance. At a press conference on Monday, a host of philanthropies announced a joint pledge of $51.7m to “accelerate the creation” of high-seas marine protected areas, which are critical for meeting the COP15 “30 by 30” target. Coral reefs are also garnering attention, with an “emergency special session” on coral reefs added to Wednesday’s schedule in response to the recent announcement that the current mass bleaching event is the largest ever. On Tuesday, ambassador Peter Thomson, UN special envoy for the ocean, warned that “we’re approaching the collapse of an entire ecosystem” and implored governments and philanthropies to open their wallets for coral reef protection.
Future plans
POLITICAL WILL: Colombian president Gustavo Petro criticised the “lack of action” on climate change and biodiversity loss around the world in a speech during COP16’s high-level segment. Petro joined five other heads of state, more than 100 ministers and other key figures at the event over 29-30 October. Petro noted that both COP16 and the COP30 climate talks, due to be held next year in Belém, Brazil, must be “decisive” and “turning points where we won’t continue doing the same thing”. UN secretary general António Guterres said in his speech that “nature is life”, but there is a “war against it”. He added: “Biodiversity is humanity’s ally. We should move from destroying it to preserving it.”
BIODIVERSITY PLEDGES: As negotiations inch towards consensus in Cali, there has been little progress on country-level biodiversity pledges, known as “national biodiversity strategies and action plans” (NBSAPs). On Tuesday, Germany released its NBSAP – leaving the UK as the only G7 nation still working to produce a new pledge. (The US is not a signatory to the Convention on Biological Diversity and so does not produce NBSAPs.) It means that 36 countries have now submitted NBSAPs, with 161 yet to do so. Countries that were unable to meet the deadline to submit NBSAPs ahead of COP16 were requested to instead submit national targets. These submissions – which have currently been submitted by 115 parties – list biodiversity targets that countries will aim for without an accompanying plan for how they will be achieved.
AMAZON ALLIANCE: A collection of organisations from the Amazon basin launched the “G9 Indigenous Amazon coalition”. The coalition aims to strengthen the voices of countries and Indigenous peoples living in that region, according to the Coordination of Indigenous Organisations of the Brazilian Amazon (COIAB). This is particularly important when they are participating in international negotiations at climate and biodiversity COPs, COIAB said. El Espectador covered the launch and reported that the G9 comprises Peru, Colombia, Brazil, Venezuela, Ecuador, Suriname, Guiana and French Guiana.
Close ties
CLIMATE LINKS: Forging closer links between action on climate change and biodiversity loss is a key priority of the Colombian COP16 presidency, with ministers expected to speak on the topic during a session of the high-level segment today. However, the negotiations for the decision text on links between climate change and biodiversity loss at the summit have been fraught. One negotiator told Carbon Brief that developing nations have concerns that tying the two problems closer together might reduce the already limited pool of funding available for either problem. Elsewhere, parties are having lengthy conversations about how the text should cover geoengineering, a term for techniques that seek to reduce warming either by drawing down CO2 from the atmosphere or reflecting sunlight away from Earth.
HEALTH TIES: A global plan to boost the policy links between biodiversity and the health of species and the environment is close to being agreed in Cali. A draft of the plan – which has been negotiated over the past four years – has just 15 square brackets (which denote matters that are still unresolved) left. Speaking at a COP16 side event, Dr Susan Lieberman, the vice-president of international policy at the Wildlife Conservation Society, said the plan is an “opportunity” to help governments tackle issues that can cause pandemics, such as the spread of pathogens from one species to another. Colman O’Criodain, the head of biodiversity policy at WWF International, told Carbon Brief in Cali: “At the end of the day, this plan is only going to be voluntary. But it’s still good guidance.”
‘ACCELERATING’ CONSERVATION: At COP16, the UN Environment Program (UNEP) and the International Union for Conservation of Nature (IUCN) launched a new report concluding that governments must “accelerate” progress to fulfil the target of protecting 30% of the planet by 2030. Currently, 17.6% of land and inland waters and 8.4% of the ocean and coastal areas lie in protected and conserved areas. However, the document added, for the countries to meet the 30 by 30 conservation target – established in the Kunming-Montreal Global Biodiversity Framework – the world will need to expand such areas.
News and views
CORPORATIONS AT COP: An investigation by DeSmog mapped the pathways to corporate influence at the UN biodiversity talks. Alongside the government negotiators are “delegates and observers from powerful industry groups, which represent the companies whose operations are actively depleting the natural world”, the outlet wrote. It listed a range of industries represented at COP16, including commodities giants, oil majors, pharmaceutical multinationals and agrochemical companies. The article said: “Compared to climate summits, where corporate logos and lobbyists are more visible, here they are flying under the radar. Yet they have found ways to tap into the negotiations.”
DON’T HAVE A COW: The loss of livestock biodiversity is “just as critical [a] biodiversity crisis” as the loss of nature’s flora and fauna, Dr Christian Tiambo of the International Livestock Research Institute argued in the Inter-Press Service. Tiambo wrote that countries must include plans to conserve livestock biodiversity in their NBSAPs. He added: “The ability to…make use of the locally adapted characteristics of indigenous breeds is becoming increasingly valuable as the impacts of climate change threaten conventional and exotic breeds.”
CONSERVING THE CHOCÓ: Colombia and Costa Rica “announced a major biodiversity agreement to fund conservation efforts across the Chocó Biogeographic Region” at the summit, Bogota’s City Paper reported. The Chocó “is a global biodiversity hotspot threatened by deforestation, climate change and illegal activities, such as mining and logging”, it added. The announcement will “mobilise resources” to protect the region, which stretches from Panama to Peru, but no details have yet emerged on the specifics of the plan.
‘ENVIRONMENTAL CRISIS’: Writing in the Conversation, Dr Jesica Lopez, who studies the Colombian Amazon, said that “the region is experiencing an environmental crisis” as “the rainforest is fast being deforested and turned into pastures for cattle ranches”. She identified a number of issues as critical to the success of COP16 and to the preservation of the Amazon, including “develop[ing] robust mechanisms to monitor progress” and “mobilis[ing] sufficient resources, particularly for developing countries”. Lopez concluded: “The summit should also work towards recognising Indigenous peoples’ rights and traditional knowledge, and including their voices in policy decisions, and must address violence against environmental defenders.”
Watch, read, listen
REVIVING A RIVER: Against the backdrop of COP16, a Deutsche Welle video explored a European plan to restore parts of the river Rhine, shared by Switzerland and Germany.
‘PLACEBO HOPE’: In the Guardian, Jonathan Watts reflected on promises made during COP season and warned of the “misuse of hope to encourage risk rather than responsibility”.
FOSSIL FOODS: A new Fuel to Fork podcast revealed the links between fossil fuels and food, looking at “how food accounts for 15% of global fossil fuel use”.
NATURE RIGHTS: Context.news looked at how Latin American countries are leading the way in granting nature legal rights and the challenges in translating court wins to conservation.
New science
- The average peak daily growth rate for “destructive fast fires” – defined as fires that grow more than 1,620 hectares in one day – more than doubled in the western US over 2001-20, according to new research published in Science. Using satellite data to analyse the growth rates of more than 60,000 fires, scientists found that destructive fast fires were responsible for 78% of destroyed structures and 61% of suppression costs in the US.
- Research in the Proceedings of the National Academy of Sciences found that a 1% increase in deforestation in the Brazilian Amazon was associated with a 6.3% jump in malaria cases the following month. Using monthly deforestation and malaria case data, researchers found that “the effect of deforestation on malaria was even larger in areas with higher forest cover”.
- The net amount of CO2 that the world’s land area absorbed last year was the smallest since 2003, said a new study in National Science Review. Land regions exposed to extreme heat in 2023 “contributed a gross carbon loss”, the researchers noted, “indicating that record warming in 2023 had a strong negative impact on the capacity of terrestrial ecosystems to mitigate climate change”.
In the diary
- 4-5 November: UN Water meeting | New York
- 5 November: US election
- 11-22 November:COP29 UNFCCC climate conference | Baku, Azerbaijan
Cropped is researched and written by Dr Giuliana Viglione, Aruna Chandrasekhar, Daisy Dunne, Orla Dwyer and Yanine Quiroz. Please send tips and feedback to cropped@carbonbrief.org.
The post Cropped 30 October 2024: The state of play at COP16 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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