International funding to help developing countries protect their communities, infrastructure and economies from climate impacts remains far below what is needed, a new United Nations report has found, leaving vulnerable nations increasingly exposed as global warming heads past 1.5C.
The UN Environment Programme’s (UNEP) 2026 Adaptation Gap Report estimates that developing countries will need about $305 billion a year to adapt by 2035 in today’s prices, or around $420 billion once inflation is taken into account. Yet international public adaptation finance from developed countries reached only $28.2-31.7 billion in 2024, a modest increase on the previous year.
The estimate is slightly below last year’s $310-365 billion, mainly because UNEP now relies more on countries’ own assessment of costs reported through their nationally determined contributions (NDCs) and national adaptation plans (NAPs).
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International funding to help developing countries protect their communities, infrastructure and economies from climate impacts remains far below what is needed, a new United Nations report has found, leaving vulnerable nations increasingly exposed as global warming heads past 1.5C.
The UN Environment Programme’s (UNEP) 2026 Adaptation Gap Report estimates that developing countries will need about $305 billion a year to adapt by 2035 in today’s prices, or around $420 billion once inflation is taken into account. Yet international public adaptation finance from developed countries reached only $28.2-31.7 billion in 2024, a modest increase on the previous year.
The estimate is slightly below last year’s $310-365 billion, mainly because UNEP now relies more on countries’ own assessment of costs reported through their nationally determined contributions (NDCs) and national adaptation plans (NAPs).
UN secretary-general António Guterres said the gap in adaptation finance is not measured in money alone but in the lives, livelihoods and futures that are lost in the process.
He called on developed countries to deliver “fast, simple, accessible support” to vulnerable countries, adding that development banks must also scale up their financing. “We know who is most at risk. We know what works. What is missing is the money and the political will. The choice is simple – invest in adaptation today or pay for catastrophe tomorrow,” he said.
At COP30 last year, countries agreed to at least triple adaptation finance for developing nations by 2035. Depending on whether that is measured from current flows or from the $40 billion that rich nations were meant to reach in 2025 under an earlier pledge, tripling would deliver $85-120 billion a year. Even if it is achieved, UNEP says, that would cover only 20-29% of developing countries’ needs in 2035.
The report warns the pledge may be less ambitious than it looks. The COP30 decision sets no baseline year, does not adjust for inflation and allows money that developing countries channel through multilateral development banks (MDBs) to count towards the target. Taking all of this into account, developed countries’ own contribution in 2035 could be as low as $45-66 billion a year in 2025 prices.
“The world is not ready to adapt to current climatic conditions, never mind what overshoot of 1.5°C will bring,” said Inger Andersen, UNEP executive director, calling on governments to intensify efforts to increase adaptation finance.
Global South countries step up
While funding from rich nations flatlines, adaptation finance flowing between developing countries is growing, though it is nowhere near enough to close the gap.
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The UNEP report estimates that developing countries contributed $9.65 billion towards international public adaptation finance in 2024, more than double the $3.81 billion recorded in 2019. That is about a quarter of all international public adaptation finance.
The report does not break the figure down by country. “These are voluntary contributions that capacitated developing countries provide via their shares in the MDBs but also through direct South-South cooperation,” said Henry Neufeldt, the report’s lead author, at a press conference on Wednesday.
Fatima Denton, the report’s co-author, said it is “comforting” to see South-South learning and cooperation because countries with similar ecosystems face similar challenges.
Loss and damage mounting
Without stronger action to cut emissions and adapt, climate-related losses and damages will keep rising, the report says, overwhelming the limited resources of the Fund for Responding to Loss and Damage (FRLD), whose complex procedures also make support hard to access.
Last month, the fund’s board agreed to set aside $20 million for Nepal’s recovery from the devastating climate-driven flood it suffered in August. It is the first money the fund has allocated since its creation, but Nepali officials called the sum symbolic against estimated recovery costs of $4.8 billion. Nepal must now submit a proposal setting out how it will use the money.
The FRLD has yet to approve any projects from its first funding round, when it received nearly 180 submissions, requiring around $2.8 billion – an amount that dwarfed the around $350 million available to allocate.
Loss and damage fund delays first project approvals as needs dwarf resources
Mattias Söderberg, global climate lead at DanChurchAid, said the risk of loss and damage grows when adaptation falls short, as communities become more exposed to increasingly severe climate impacts.
“When we fail to invest in adaptation today, we risk paying a much higher price tomorrow. And that price is not only measured in dollars. It is measured in lives lost, homes destroyed and futures taken away,” Söderberg added.
A failure to match climate ambition
Ahead of COP31 starting on Monday in Antalya, climate campaigners are calling on rich governments to set out how to close the remaining gap and meet developing countries’ full adaptation needs.
Pooja Dave, adaptation lead at Climate Action Network International, said COP31 must agree a credible plan to deliver at least US$120 billion a year in adaptation finance well before 2035, through new and additional public, grant-based funding that reaches the communities most at risk.
“People have a right to a climate safe world and protection from climate impacts. Adaptation is not charity. It is a legal and moral obligation,” Dave said.
Mohamed Adow, director of Kenya-based climate change think tank Power Shift Africa, said COP31 must establish a clear starting point, milestones and a credible delivery plan, especially on how public finance, in the form of grants not loans, must reach those most at risk
“Communities facing floods and droughts cannot wait until 2035 to find out what this promise means,” he said.
