I'm more worried about it getting colder than hotter. We can deal with heat, but when the world starts getting colder (and it will at some point) mass extinction will occur. Just a few degrees colder, as it was in the little ice age, can have a devastating effect on agriculture and livestock.You have to think that our modern mobility would allow us to out pace whatever climate shift happens. I mean if it keeps heating up, it seems that some northern climates all of a sudden get more agriculturally productive?