So let me preface this by saying I am not trying to be facetious.
On what basis do we say "not warmer than today"? I know there is a lot of research that has been done demonstrating warming in the last several decades. Is there any research that has been done to determine optimum temperature?
Huge tracts of land in Canada and Russia are plagued by short growing seasons. Would a longer growing season in these regions allow us to grow more food to feed the (7 billion?) people of earth?
Or would cooling the earth make Africa better able to feed their own people?
Has anyone ever tried to quantify this?