Here is another critique of the AGW hypothesis by a real scientist.

http://www.americanthinker.com/2008/11/global_warming_bring_it_on.html

It is hard to see how Al Gore and the IPCC manage to keep the politicians and the MSM convinced that the AGW hypothesis is valid, given all of the data now available that disprove the hypothesis. It may be that those folks are using AGW to advance an agenda, and are not interested in whether or not the hypothesis is valid. For most of them the end justifies the means.