While a guidebook with requirements for adaptation as a principle or significant objective has been developed , several studies have shown that OECD DAC donors tend to overestimate the number of activities in their portfolio that genuinely have adaptation objectives . Hence, the amount of adaptation finance from public sources may be lower than reported. The use of just three categories leads to a broad range of the extent of adaptation being concentrated in the middle category . Accordingly, the category 'principle objective adaptation' provides a more robust predictor of the relevance of an activity to adaptation .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report