Freeman Dyson say it's not Global Warming

Freeman Dyson is a very prominent physics professor at the Institute for Advanced Study in Princeton, now retired.

His most useful contribution to science was the unification of the three versions of quantum electrodynamics invented by Feynman, Schwinger and Tomonaga. Cornell University made him a professor without bothering about his lack of Ph.D. He subsequently worked on nuclear reactors, solid state physics, ferromagnetism, astrophysics and biology, looking for problems where elegant mathematics could be usefully applied.

Classical Values links to two videos of him speaking about global warming: He starts out in the first video talking about vegetation. He says you can't do good science without good data. He notes that the data on vegetation is sparse (as in almost totally non-existant). The money went into computer models instead of data gathering. It figures. Computers are sexy. Electronic wind vanes and anemometers are not. He also notes that the carbon in vegetation dwarfs the carbon in the atmosphere. In the second video he says the real problem is not CO2 induced global warming, but CO2 induced stratosphere cooling which may lead to bigger ozone holes. He ends with the fact that the lowest cost way to control CO2 in the atmosphere is not by controlling energy production and use, but by planting or cutting down plants. He suggests more irrigation. For that we are going to need cheap fresh water. And a source of fresh water: the Bussard Fusion Reactor.