That's true. I'm aware of a series of greenhouse experiments in which Spartina (a saltmarsh grass) grows more vigorously with elevated CO2 & temp.

A downside of CO2 & temp increase is lower O2/CO2 ratio in the ocean. This is bad for life. In the Triassic (IIRC) this shift led to a few million years of anoxic oceans and low O2/CO2 atmosphere in which most living creatures could not live above sea level due to lack of oxygen.

There is more that we don't know about climate than we know. Today is a good predictor of tomorrow, but not perfect.