Here are some intesting articles on Global Warming. This article by Roy Spencer is very good in describing how precipitation is the key to climate, but is not well predicted in the IPCC global circulation models.

http://www.nypost.com/seven/02262007/postopinion/opedcolumnists/not_that_simple_opedcolumnists_roy_w__spencer.htm

This next article describes problems with large numerical simulations. My experiences with numerical modeling was in a different field, but were similar. We always had to use experiments and tests to validate the models so that we could trust the predictions. One problem I have with the IPCC models is that they faked the data that they validated the models with.

http://www.americanthinker.com/2007/02/numerical_models_integrated_ci.html