Section 3: Ecosystem Collapse is particularly relevant, but the article also goes into overpopulation and resource depletion.
Kaiho suggests that if we continue to reduce our GHG emissions (leading to a 3°C warming by 2100), the average animal species loss will reach 10-15 % between the years 2060-2080 or a maximum of 33 % in the worst case. The author suggests this would be sufficient to avert an ecosystem collapse with catastrophic impacts, that could happen if we continued burning fossil fuels or engaged in a nuclear war. However, "ecosystem collapse" is only operationalized as the extinction of 20-50 % of animal species. Although it's a common meme that e.g. keeping the biodiversity loss under 10 % is necessary for civilization, the aforementioned reviews haven't found evidence such a tipping point exists.
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