It was water that stripped nearly everything from Tambudzai Chikweya’s life on the night of March 15, 2019.
As Cyclone Idai tore through Chimanimani, her hometown in Zimbabwe’s eastern highlands, it unleashed floods that swept away her house and claimed the life of her eldest daughter. Chikweya was rescued only after spending the night pinned between a wardrobe and a bed, unable to free herself from the mud.
More than five years later, water again stands in the way of Chikweya’s attempts to build a new life for herself and her family. But this time, the problem is that there isn’t enough of it.
The mother-of-three has been resettled in Runyararo, a vast expanse of sun-baked semi-arid land where the Zimbabwe government has been building brick homes for hundreds of people displaced by the cyclone, on the site of a former colonial farm more than 60 kilometres away from Chimanimani.
High temperatures of up to 34 degrees Celsius and erratic rainfall make access to water in Runyararo “inadequate”, according to government documents. The situation has been made worse this year by a severe drought – dubbed “historic” by the UN – which has affected much of Southern Africa and was sparked by the El Niño weather pattern.
“Not having enough water and drought-induced hunger are challenges here,” Chikweya said, speaking through a translator when Climate Home visited her home in Runyararo last September on a trip organised by Danish humanitarian NGO DanChurchAid.
“It was a very difficult decision for us [to move here],” she added, “It weighed on us for a long time.”
Tambudzai Chikweya walks past some of the land she was allocated by the government as part of the resettlement project. Photo: Matteo Civillini
The reality has also proved tough. Standing in front of a small vegetable patch where she grows tomatoes and kale, Chikweya described the struggle she faces in getting enough food to feed herself and her children at least once a day.
She tried to grow potatoes on a large plot of land donated by the government – but the crops failed in the bone-dry soil as a result of the stifling heat and a shortage of water.
Climate Home asked Zimbabwe’s government why storm-hit communities were resettled in a known drought-prone area, but had not received a response by the time of the publication.
Multiple climate threats
Chikweya’s situation underscores the wide range of climate-related threats affecting vulnerable communities in a country like Zimbabwe where the frequency and intensity of both storms and droughts are projected to increase as the planet heats up.
The situation in Runyararo also highlights the complexities of the critical decisions facing cash-strapped governments that need to ensure their efforts to help people recover from one disaster also make them better able to withstand future hazards.
Mattias Söderberg, global climate lead at DanChurchAid, said adapting to multiple climate stresses “is not just a tick-box exercise”, but must be grounded in a “thorough assessment of the expected climate effects”.
Development organisations and government authorities leading adaptation projects need enough expertise to take into account expected climate impacts in the future as well as what is happening now. “Otherwise adaptation investment may be lost, and people will live in a false sense of safety,” Söderberg said.
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Doing that in practice, however, can add to the upfront costs of adaptation measures. To tackle the lack of water in Runyararo, for example, the national government has sketched out plans to build a dam on a nearby river and bring a stable water supply into the area. But a lack of funding has put the dam project beyond reach for now.
It is a familiar dilemma for developing nations struggling to bridge the widening gulf between the impacts of climate change and the shortfall of money available to address them.
International public funding to protect communities in poorer, vulnerable countries from worsening extreme weather and rising seas is only a fraction – between 7% and 13% – of what is needed, according to the latest Adaptation Gap Report published on Thursday by the UN Environment Programme (UNEP).
UNEP said governments have an important opportunity to “alter this trajectory” at the upcoming COP29 summit, starting next week in Baku, Azerbaijan. The talks are expected to agree on a new post-2025 global climate finance goal to help developing countries tackle climate change – but deep divisions remain on what it should consist of, how large it should be, and who should contribute to it.
For Zimbabwe, the money could make all the difference when dealing with another climate disaster.
‘Surrounded by floodwater’
Back in 2019, Joseph Maphosa was fast asleep when the water brought by Cyclone Idai burst through the front door of his home late at night with such force that it lifted up his bed.
Idai was then passing through Kopa, a settlement lying on a plain at the confluence of three rivers. Conditions making it particularly prone to flooding and landslides would turn Kopa into the epicentre of the disaster.
After fleeing his house by hanging onto the roof trusses, Maphosa eventually climbed up into a tree with three of his neighbours. They spent the next 48 hours there alone.
“The rain was coming down all around us, there was nothing we could do,” he recounted more than five years later. “No one could help us because we were just surrounded by floodwater.”
By the time rescuers arrived and took the four people to safety, the water had started receding and the devastation caused by the cyclone was laid bare.
It was Zimbabwe’s most devastating natural disaster on record.
Travail Ngorima looks at the remnants of his family home in Kopa that was destroyed by Cyclone Idai. (Photo: Matteo Civillini)
More than 70 households were swept away in Kopa alone. Across the country, 344 people died, with over 250 reported missing and 60,000 displaced by the disaster. The cost of damage to property and infrastructure ranged between $542 million and $616 million according to a rapid impact assessment by the World Bank which funded a wide-ranging recovery programme.
As the government and development agencies set about rebuilding homes, roads and bridges and restoring local people’s livelihoods, they promised that similar cyclones would never have the same calamitous consequences.
‘Building back better’
“We said, ‘we don’t need to build back better anymore – we want to build back better first time’,” John Misi, acting director for local government services in Manicaland Province, told reporters visiting the area in September.
“We challenged our local authorities that no one was going to build a structure, a home, a shelter, without getting technical support from the council so that we build more resilient infrastructure,” he added.
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On a three-day trip across the province, Climate Home saw a mixed picture of how the recovery efforts have unfolded five years on from the dramatic events caused by Idai.
Key infrastructure – including many roads and bridges – was repaired, restoring access to remote communities.
Still, a large swathe of the floodplain in Kopa remains littered with giant boulders that came rolling down from the mountains as a result of the cyclone, destroying everything in their way.
Even so, a dozen metres away, the local business centre is a hive of activity. New buildings are being erected, helping locals to earn a living but also fuelling concerns over what would happen if a fresh climate disaster struck.
New commercial buildings are springing up in Kopa, a flood-prone area. (Photo: Matteo Civillini)
“There is no order – these businesses are just coming up,” said Maphosa, who now works in Chimanimani’s civil registry office. “It is a great risk to build there. [With Cyclone Idai] water got into the shops there but people are still building them there anyways.”
While commercial buildings are being constructed in Kopa, an official told Climate Home that the local council denied permission to rebuild residential houses there.
Most people made homeless by the disaster found shelter with families or host communities, but hundreds of households ended up in temporary camps waiting to be given a new permanent home elsewhere.
Settling in the ‘land of peace’
The centrepiece of the Zimbabwe government’s resettlement plans lies in Runyararo, which means “land of peace” in the local Shona language. The settlement lies at the end of a long dirt road nearly two-hours’ drive away from Chimanimani.
Here, on a largely empty piece of barren land traditionally used for cattle-grazing, the government built 159 new homes for displaced people – with close to a hundred more in the pipeline – as well as a primary school and a small hospital.
In addition to a four-room house, new residents are allocated 2.5 hectares of land that they can use to grow crops or keep animals.
Hundreds of households displaced by Cyclone Idai have been resettled in Runyararo, more than 60 km away from their previous hometown. (Photo: Matteo Civillini)
Chikweya moved to Runyararo in 2022 after spending three years in a tent camp. She said she was grateful to the government for her new house, but she has been struggling to adjust to a life full of fresh challenges.
“It is more isolated here,” she said. “In Chimanimani, I used to sell things and there was always someone who would buy from you, which helped me get by.”
Chikweya now keeps goats and chickens and tends her vegetable patch – but her ambition to put the rest of her land to productive use to grow food has failed because she cannot irrigate it regularly.
The shortage of water afflicts everyone in the area – and it’s becoming more acute as the government has resettled cyclone survivors there.
“It’s always been like this here,” lamented another resident during a community meeting. “But because there are a lot of people now, the little water that was here is now being used by too many people. It’s getting to a point where the water just dries up.”
Struggle to boost water access
Boreholes to tap underground water were drilled in the area, but a lack of rain during the ongoing drought means the water table has been getting lower and some of the boreholes have dried up, a local official said.
German charity Welthungerhilfe (WHH) stepped in to help, with funding from the US government’s development agency USAID. It drilled two more boreholes and installed solar panels to pump water into a large storage tank and from there to a network of taps situated closer to the homes.
Yet, while the scheme has offered a welcome reprieve for the community, water stress persists – and the struggle for a sufficient supply could get worse as the number of residents grows.
Matthias Späth, WHH’s country director in Zimbabwe, told Climate Home it was “saddening to see how quickly the water level is shrinking” when he visited Runyararo recently.
“We did the best we could with the available resources,” he said. “We ensured that no IDP [internally displaced person’s] household was more than 100 metres from a water point.”
Tambudzai Chikweya stands by one of the water points installed by WHH. Photo: Matteo Civillini
Späth added that, given water shortages across the wider area, the system designed for the new residents “has likely been overloaded” because people living there before the resettlement project have also been using it. “A larger budget would have enabled us to extend the water system to the host community,” he said.
A lack of funding is also putting the brakes on a project the government believes could offer a long-term solution. Under the plans, a dam would be built on a river up in the nearby hills and a 30-km pipeline would channel the water from there to the community in Runyararo.
But, for now, there is no money to put the costly project into practice, local officials told Climate Home.
Späth said he was concerned that current global geopolitics and national economic hardship would make it hard to mobilise the funds needed to build a dam. He also said water quality in the river would need to be assessed to ensure it is suitable for filling the dam, partly because livestock also use it for their needs.
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Misi of Manicaland province said the administration has been doing its best in Runyararo but acknowledged that “it is a work-in-progress” and challenges remain.
“We want to make that settlement as good as the area that they [the displaced people] stayed in before the cyclone,” he said.
For Chikweya, that day cannot come soon enough as she reflects on her life before Cyclone Idai.
“Chimanimani was basically an oasis. We’d never run out of water – we could always access fresh food,” she said. “Here it’s more difficult.”
(Reporting by Matteo Civillini; editing by Megan Rowling)
Danish NGO DanChurchAid organised and sponsored Climate Home’s trip to Zimbabwe.
The post From cyclone to drought, Zimbabwe’s climate victims struggle to adapt appeared first on Climate Home News.
From cyclone to drought, Zimbabwe’s climate victims struggle to adapt
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
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.
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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.
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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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