There is a temperature range in which organic life flourishes the most. Too cold, chemical reactions slow down to a crawl or stop. Too hot, organic compounds br

There is a temperature range in which organic life flourishes the most. Too cold, chemical reactions slow down to a crawl or stop. Too hot, organic compounds break up. Somewhere in between is the sweet spot. So a warmer planet relative to now doesn’t have to be bad. Maybe Earth would even get closer to the sweet spot, from a global perspective. The problem is the transition speed to the new global average temperature. 4°C increase over a million years: Organisms have time to evolve and to adapt to the new conditions. The same change in 100 to 200 years: Many species will suffer, especially ones occupying ecological niches. Regarding humans: Generally speaking, existing infrastructure is not equipped to handle the extremes that occur more often when Earth is warmer, e.g. rains can cause more floods because warmer air transports more water.