One basis for the prediction of global warming are the mathematical models run on the various supercomputers, such as the Earth Simulator in Japan.
However, none of the computer models, even the ones run on the biggest and fastest machines, are accurate. Period. This is not a fact (and it is a fact) that is mentioned.
Why are they not accurate?
Because they are not able to accurately model the effect that temperature changes have on the oceans of the world, which just happen to cover 75% of the earth's surface. No one, not the folks at Woods Hole, at NASA, etc. understands "how the ocean works" well enough to model its behavior.
Global warming has been a farce since the mid-80s at least.
