I recently rode a Greyhound bus from Pittsburg to Phoenix, and I saw MILES and MILES of NOTHING for DAYS! There is plenty of room and resources for TEN times as many people we have now. Remember looking down from a plane last time you flew? More undeveloped landmass than civilization, wasn't there...
If I hear either 'overpopulation' or 'global warming' coming out of someone's mouth, I might as well turn around and have them KISS MY A$$!