Hot Earth part 4

Oh, here's some more crap from some dude from MIT:

Indeed, one overlooked mystery is why temperatures are not already higher. Various models predict that a doubling of CO2 in the atmosphere will raise the world's average temperature by as little as 1.5 degrees Celsius or as much as 4.5 degrees. The important thing about doubled CO2 (or any other greenhouse gas) is its "forcing"—its contribution to warming. At present, the greenhouse forcing is already about three-quarters of what one would get from a doubling of CO2. But average temperatures rose only about 0.6 degrees since the beginning of the industrial era, and the change hasn't been uniform—warming has largely occurred during the periods from 1919 to 1940 and from 1976 to 1998, with cooling in between. Researchers have been unable to explain this discrepancy.

The Romans used to have vineyards in today's England. The Vikings used to raise cattle on Greenland. Where I'm typing this used to be under a mile of ice as recently as 12,000 years ago, which is practically yesterday if you buy that Earth is 4.2 billion years old. But we're supposed to accept man-made climate change because guilty 40-year olds 'remember' more white Christmases when they were kids.