Aichi Target 12 of the Convention on Biological Diversity (CBD) contains the aim to ‘prevent extinctions of known threatened species’. To measure the degree to which this was achieved, we used expert elicitation to estimate the number of bird and mammal species whose extinctions were prevented by conservation action in 1993–2020 (the lifetime of the CBD) and 2010–2020 (the timing of Aichi Target 12). We found that conservation action prevented 21–32 bird and 7–16 mammal extinctions since 1993, and 9–18 bird and two to seven mammal extinctions since 2010. Many remain highly threatened and may still become extinct. Considering that 10 bird and five mammal species did go extinct (or are strongly suspected to) since 1993, extinction rates would have been 2.9–4.2 times greater without conservation action. While policy commitments have fostered significant conservation achievements, future biodiversity action needs to be scaled up to avert additional extinctions.

中文翻译：

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最近阻止了多少鸟类和哺乳动物的灭绝行动？

《生物多样性公约》（CBD）的爱知目标12旨在“预防已知受威胁物种的灭绝”。为了衡量实现这一目标的程度，我们利用专家启发估计了1993-2020年（《生物多样性公约》的使用期限）和2010-2020年（爱知时期）通过保护行动防止灭绝的鸟类和哺乳动物的数量。目标12）。我们发现，保护行动阻止了自1993年以来的21–32只鸟类和7–16种哺乳动物的灭绝，以及自2010年以来的9–18种鸟类和2至7种哺乳动物的灭绝。许多物种仍处于高度威胁之中，甚至可能灭绝。考虑到自1993年以来10种鸟类和5种哺乳动物确实灭绝（或被强烈怀疑是灭绝），如果不采取保护行动，灭绝率将增加2.9-4.2倍。