What exactly is "the" "right" climate?
The fact that climate change is a problem doesn't imply that there's a "right" climate. The rapid rate of change itself is the problem - and particularly the fact that that rate of change is faster than organisms and systems can adequately adapt to. Atmospheric CO2 levels have previously, naturally, been higher than they are today. The most recent time that they were that high, the land on which most of our populatio…
What is the right rate of change? The answer does not have to be very precise. An estimate within an order of magnitude is OK.