UNEP: Tripled adaptation finance could cover only 20–29% of developing-country needs

What happened

The UN Environment Programme’s Adaptation Gap Report 2026 estimates that developing countries will require roughly $305bn each year for adaptation by 2035. Its estimate increases to $420bn annually after allowing for possible inflation.

The COP30 objective is to at least triple adaptation finance by 2035. On UNEP’s higher interpretation of that commitment, international adaptation finance would amount to $120bn per year. That would cover between one fifth and 29% of projected needs.

International public adaptation funding from developed to developing countries stood at $28.2bn to $31.7bn in 2024, around $1bn above the previous year. Finance provided by developing countries to other developing countries rose from $3.8bn in 2019 to $9.6bn in 2024, but is not included in existing developed-country targets.

Private adaptation funding mobilised through international public finance reached $3bn in 2024, twice its 2019 level. UNEP also identifies another $3bn in private flows worldwide, while cautioning that recorded figures may not capture all investment.

Why it matters

The figures underline the scale of the financing challenge facing the countries most exposed to climate impacts. UNEP says private funding cannot simply take the place of public support, because it often protects companies’ own operations, assets and supply chains rather than public priorities.

For Türkiye, which is due to host COP31 in Antalya, the issue will be central to discussions on turning global funding goals into measures that reach national and local projects. Funding levels are not the sole constraint: governments also need clear legal frameworks, defined institutional responsibilities, coordination, public participation and accountability.

Among 118 countries assessed, 89% mention loss and damage in national climate pledges or adaptation plans. Yet only 54% have arrangements to gather loss-and-damage information, and 38% have a related legal framework.

Background

Least developed countries and small island developing States have combined adaptation needs of about $50bn a year, equivalent to around 3% to 4% of their gross domestic product. UNEP estimates that higher flows could meet 49% to 84% of their needs by 2035.

In 2024, grants or highly concessional loans accounted for almost 90% of adaptation finance directed to least developed countries and 80% of that received by small island developing States. UNEP warns that greater reliance on non-concessional debt could intensify fiscal pressure in countries with limited borrowing capacity.

What's next

By 2035, the COP30 commitment aims to at least triple adaptation finance. UNEP’s assessment points to a parallel task for governments: improve access to funding and strengthen the institutions needed to convert plans and finance into delivered adaptation measures.