The CBD set the Aichi 2020 Target at 17% of each country to be protected for biodiversity. Analyses suggest that 30% or even 50% of land and sea needs to be protected or restored to confer adequate protection for species and ecosystem services  . Hannah et al.  estimated that limiting warming to 2ºC and protecting 30% of high-biodiversity regions  reduced the risk of species' extinctions by half . The placement of protected areas is as important as the total area , and the quality of the protection  is as important as the official land designation . Pimm et al.  found that many small protected areas are successful because they are in areas of very high biodiversity containing species with small range sizes, while many large regions identified as wild are often of low biodiversity value even though they may have a high mitigation value . A global meta-analysis of 89 restoration
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report