The True Believers will never change their views, and verbally violently (insults, accusations of lying, blanket derogatory claims, such as at http://scienceblogs.com/illconsidered/, and Desmogblog) defend the faith. No amount of evidence is able to make these people consider rethinking their position. From what I have seen this violent/bigoted behaviour exists only from the true believer side. It’s like questioning or challenging their faith is a personal attack against them. It’s a behaviour I have seen on the political far-left as well, which many of the True Believers co-occupy. Thus from this perspective, the AGW “debate” is not about the science, but a political worldview battle. That will never stop.
AGW has just given these people a rally point: “see humans are evil creatures after all destroying the planet.” Yet these people won’t take the logical first step, if we are all so destructive, by removing their own contribution to that destruction.