The point the doomsdayers are trying to make is that the earth is .6 degrees warmer. That could equate to up to 10 degrees in the polar region, which will melt ice and flood Manhattan. Also back in the 70s they thought that greenhouse gasses would cool the earth, as it would block out some of the suns rays.
The computer models are farked, and it is all a political ploy by the IPCC to rob the rich and give to the poor, which in actuality means Canada will become a THIRD WORLD country as we lose high paying manufacturing jobs, personal debtload increases, and high intrest rates force people out of their homes as the next recessions takes hold.