LA Times fears "centuries of weather extremes, drought-fueled global famine, mass migration, the vanishing of low-lying islands and territories as sea ice melts away, wide-scale species extinction and other horrors too numerous and depressing to list"

http://opinion.latimes.com/opinionla/2012/02/mann-climate.html

we've already sailed past that point. And we're heading inexorably toward another one that's far worse: 450 parts per million, the truly scary level at which 3.5 degrees of warming above pre-industrial global average temperatures is locked in. The predicted result: centuries of weather extremes, drought-fueled global famine, mass migration, the vanishing of low-lying islands and territories as sea ice melts away, wide-scale species extinction and other horrors too numerous and depressing to list.