It is already too late. The extinction already started. Right now it is insects, frogs and fishes that has got to go. Our time , together with the rest of vertebrates, will come in 60-70 years.
This is my feeling too. I feel that even the scientists doing these studies are not considering all of the positive feedback loops. If we could somehow account for everything we’d see that we are already past the point of no return and things are going to change for the worse much faster than anticipated.