There is still some debate on what qualifies as adaptation finance and how such finance should be measured . According to the Climate Policy Initiative, adaptation finance is 'finance with the aim of improving preparation and reducing climate-related risk and damage, for both human and natural systems, as short-term climate impacts will continue to exact economic, social, and environmental costs even if appropriate mitigation actions are taken' . According to UNEP, the annual costs of adaptation in developing countries could range from USD 140 billion to USD 300 billion by 2030. Globally, adaptation costs are estimated to be even greater, with up to USD 500 billion yr-1 by 2050 under a Business-As-Usual scenario . While global climate finance flows reached USD 579 billion on average over the 2017/18 period, there has been a continued heavy imbalance in favour of mitigation finance, with adaptation finance totalling around USD 30 billion , or 5% of tracked climate finance. The World Bank has, however, committed to increase direct adaptation finance to USD 50 billion over the 2020-25 period, putting the Bank's adaptation finance in developing countries on par with its mitigation investments . Adaptation finance is also growing alongside finance for actions with both mitigation and adaptation benefits, for example in forestry or agriculture, which rose to just over USD 12 billion , as well as increasing focus on adaptation and cross-sectoral projects. Looking only at climate finance flows from developed to developing countries, the OECD estimates a total of USD 78.9 billion mobilised in 2018, with mitigation accounting for 70%  of the total, adaptation 21%  and cross-cutting finance making up the remainder .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report