The problem is NO ONE really has a clue as to what that is. The same clowns and imbeciles who think "lockdowns are best for humanity", "masks are best for humanity","eating margarine is best for humanity", now want to play GOD with the climate.
Oh yes we do know. Ice ages in which most of Europe and the US are under ice would be bad, for example, So also would periods of exreme heat and drought.