> The [PETM] warming, 5 degrees Celsius in about 5,000 years, wiped out much benthic marine life, pushed the tropics to Wyoming and alligators to the Arctic Circle, warmed oceans to 97 degrees, and made the equatorial regions too hot for many species.

> future ecosystem disruptions are likely to exceed the relatively limited extinctions observed at the PETM

> Assuming business as usual, we may reach PETM levels in 140 years.

https://thecottonwoodpost.net/2019/12/10/modern-climate-change-is-10x-faster-than-historic-global-warming-mass-extinction-events/