Adaptation finance is a contested issue at COP31, which opens in Antalya on November 9. On November 4, UNEP released its 2026 Adaptation Gap Report, which estimates that developing countries will need around $305 billion a year by 2035. For companies in infrastructure, insurance, agriculture and water, the report offers a current measure of how much resilience spending is planned and how much remains unfunded.
What UNEP found
The report says international public adaptation finance from developed to developing countries reached $28.2 billion to $31.7 billion in 2024. Its $305 billion needs estimate is stated in 2024 prices and averages two lines of evidence: national plans and modeling. Adjusted for inflation, that need becomes about $420 billion in 2035.
COP30 set an aspiration of tripling adaptation finance by 2035. UNEP calculates that tripling would produce $85 billion to $120 billion a year, covering 20 to 29 percent of estimated needs. For the least developed countries and small island developing states, tripling would go further, meeting 49 to 84 percent of 2035 needs.
The estimate excludes private-sector adaptation needs, which UNEP says could almost double the overall figure. Mobilized private adaptation finance rose from $1.5 billion in 2019 to $3 billion in 2024. Loans made up 55 percent of adaptation finance to developing countries in 2024, and grants 44 percent.
“The world is not ready to adapt to current climatic conditions, never mind what overshoot of 1.5°C will bring,” UNEP Executive Director Inger Andersen wrote in the foreword.
Other official numbers
Two UNFCCC Standing Committee on Finance reports, published October 27, add context. They use different methods from UNEP, so the figures should not be added together. The Seventh Biennial Assessment says tracked global adaptation finance averaged $63 billion a year in 2023 and 2024, down 20 percent from a revised 2021 to 2022 base. Public sources provided 89 percent of it. Overall climate finance, by contrast, rose 32 percent to an annual average of $1.9 trillion.
The third report on the $100 billion goal says developed countries provided and mobilized $132.8 billion in 2023 and $136.7 billion in 2024, on OECD figures. Adaptation-specific finance was $34.7 billion in 2024 on the same basis. The report notes other estimates, including lower grant-equivalent figures from Oxfam.
The dispute heading into Antalya
The negotiating question is whether the tripling aspiration gains a firmer form. Climate Home News reports that developed countries declined in Bonn in June to include a tripling target in the text on the Global Goal on Adaptation. It quotes Africa Group chair Antwi-Boasiako Amoah as saying that “nobody is even sure of the [tripling] baseline.”
A decision on baseline and pathways would give finance ministries, development banks and project sponsors a clearer planning figure. Without one, the numbers above remain estimates from separate reports rather than a shared target.
Sources
- UN News: Climate adaptation cash falls far short as warming heads past 1.5°C, November 4, 2026
- UNEP: Adaptation Gap Report 2026 (full text, copy hosted by tralac)
- UNFCCC Standing Committee on Finance: Seventh Biennial Assessment, executive summary
- UNFCCC Standing Committee on Finance: Third report on progress towards the USD 100 billion goal, executive summary
- Climate Home News: COP31 briefing, November 5, 2026
