A coorection: the skeptic on the causes of global warming is Freeman Dyson, the physicist, not Eric Dyson, the historian. Freeman Dyson thinks that CO2 emissions are one of the causes of the increase in atmospheric heat energy, but also thinks that there is something unscientific about the consensus that has built up among climate scientists.

Dyson was on a working grooup investigating climate change in the late '70s, so he is not someone coming from nowhere with an opinion. He is also someone who never got the Nobel he desrved, in great part because he is so willing to challenge the mainstream - on any topic.