Annan refutes Evans' skeptic arguments

James Annan, who's done more than anyone to promote the idea of betting over global warming, refutes David Evans' arguments here. Sounds pretty good to me (other than the Bayesian statistics stuff, which is beyond me). Money quote:

Are we really supposed to believe that the planet is highly sensitive to some speculative and unquantified mechanism such as cosmic rays, and simultaneously insensitive to an effect that's been reasonably well understood for over 100 years? Why?

UPDATE: Evans responds in the comments, and here.