it extremely is an uncomplicated one. If the international gets too warm, we've shown that we are able to proceed to exist it because of the fact the "Cradles of Civilization" have been in warm, dry areas. If the international gets chilly, then we've already shown that we are able to stand up to ice a while, and that's with none "extreme" technologies. If the international gets overpopulated, it is going to, out of necessity, stability itself out. i don't think of we'd desire to stress approximately surviving the subsequent one hundred years. the actual question is a thank you to we shop the subsequent one hundred years from transforming into the subsequent dark Age.