We aren't even nearly as warm as we've been in the past via the flora and fauna record and we've stalled for the past 6 years, actually cooled the last couple of years, which no models predicted. It's theory, not fact because there are holes that can't be explained in the theory. Societies have grown and collapsed due to climate change in the past so what we need to focus on is dealing with climate variation. Check out the snow pack in the Colorado Rockies right now, runoff hasn't even taken off yet due to cold and snow, it is just starting to build now, in late May. Arapahoe Basin ski area is still open with a 73" base. It stays open until early May through early June usually but might even make it to July 4th this year like it did in 2011 when the base was in the 90" range in May. So twice in four years the snow pack is well above median and average.