[Sharlin]

And the "hothouse" Earths were drastically different from Earth today. Given time, life adapts, but the point is that there's no time. There have been sudden, drastic global climate changes in Earth's history before. It's just that they have been accompanied by massive extinction events. Whatever we do, we probably won't destroy the whole ecosystem. But that's a rather ridiculously low bar to clear!

[ppf]

Sure, the "hothouse" earths are at the drastic end of the scale, but earth has spent significant periods of time at temperatures a few degrees above current. "There is no time" is a complex assertion that needs at least some research, and if there really isn't, what do you propose we do?