Mesoscale Global Warming has been occurring for natural causes yet to be determined since the end of the last Ice Age.
The ramification to us, apparently, is the flourishing of human civilization. LOL! However, there was possibly a flourishing around 12,000 years ago which was snuffed out, possibly because of a significant rise in the ocean level which obliterated much of the older civilizations.
It is a fun puzzle.
I think the Siberians and the Canadians are rooting for Global Warming.
While I think the Nick Danger theory may be the explanation, if this story holds true will we now have the derisive title for GW of "Global Warming" Bush?