I would guess 150 years. I think by the beginning of next century we'll have the engineering prowess to use large-scale geoprojects to basically set the climat

I would guess 150 years. I think by the beginning of next century we'll have the engineering prowess to use large-scale geoprojects to basically set the climate to whatever we want. (As long as we don't suffer a massive world-wide societal or economic collapse in the interim).