Some notes on global warming.
Concerning the climate models, I know enough of the details to be sure that they are unreliable. They are full of fudge factors that are fitted to the existing climate, so the models more or less agree with the observed data. But there is no reason to believe that the same fudge factors would give the right behavior in a world with different chemistry, for example in a world with increased CO2 in the atmosphere.
Neither does Canada's Fraser Institute.
A different, but still reasonable, perspective from someone whose economics resembles mine, Gregg Easterbrook.