Climate adaptation finance flows from public multilateral and bilateral source declined by 15 per cent to around $21 billion in 2021.
The finance needs of developing countries are now 10-18 times as big as international public finance flows.
For developing countries, the total cost of adaptation amounts to $215 billion per year.
Modelled adaptation costs for Least Developing Countries and Small Island Developed nations are estimated at $25 billion per year (2 per cent of GDP) and $4.7 billion per year (0.7 per cent of GDP), respectively.