In the Skeptics Handbook, Jo Nova notes a number of former warmists who became skeptics, Ivar Giaever, Claude Alegre, David Evans, Nir Shaviv and Richard Courtney amongst them. But it’s really one way traffic, isn’t it? You don’t hear too many tales of skeptics turning into alarmists. To use a chemistry analogy, it’s not a reversible reaction like the dissociation of water, it’s more like a combustion reaction. You can’t unburn what’s already burnt. I guess that’s what is happening to the global warming movement. Like a combustion reaction, it’s going up in flames.
This reaction however was going along very slowly however, until late 2009. Since climategate, believers switched sides faster than they had before. It was a very effective catalyst, and in being partly responsible for the failure of Copenhagen, served as the turning point in the global warming debate.