- Bishop Hill blog - Chivers on cosmoclimatology

http://www.bishop-hill.net/blog/2012/2/11/chivers-on-cosmoclimatology.html

We know that there is nothing in the temperature record itself to distinguish the recent warming from what has gone before - the claim that man has warmed the Earth depends on computer models whose temperature predictions are not validated. More relevantly to this posting,to the extent that the cosmic ray effect turns out to be real, the influence of CO2 will be less than previously thought. This is a potentially very big "known unknown" to go alongside the "unknown unknowns" that cannot be ruled out because of the lack of any validation of the models. It seems to me that sceptics are therefore correct to draw attention to Svensmark's work.