The climate panic-mongers need to explain some things. This, for instance, from Steven Mithen’s After the Ice: A Global Human History 20,000-5000 BC (quoted at Watts Up With That:

The next century of human-made global warming is predicted to be far less extreme than that which occurred at 9600 BC [11,600 BP]. At the end of the Younger Dryas, mean global temperature had risen by 7°C in fifty years, whereas the predicted rise for the next hundred years is less than 3°C. The end of the last ice age led to a 120 meter increase in sea level, whereas that predicted for the next fifty years is a paltry 32 centimeters at most,….

The timeline that opens the article at the link is complex, and it’s instructive. So is Andy May’s article at that link.