One of the curious aspects of the AGW situation is that the believers desire draconian changes to the world, including institution of a world government. Not all of those who believe in AGW think that such actions are necessary. Bjorn Lomberg is one example. Here is an article about William Nordhaus, whose models show that doing nothing produces about the same result as the Kyoto Protocol with the US included.

http://www.theglobeandmail.com/servlet/story/LAC.20080702.RREYNOLDS02/TPStory/Business

One thing I have always wondered about: how was it established that the ideal temperature for Earth occurred in 1900?