There is a lot of discussion amongst scientific types about whether or not the global warming "greenhouse gas" theory violates the second law of thermodynamics. Most people have difficulty with the concept of the second law of thermodynamics, so this argument is usually ignored in the popular press. Gerlich and Tscheuschner have written a paper that they say falsifies the greenhouse gas theory. I read an earlier draft, and found it tough going; it includes some terminology with which I was not familiar. Much of it is obvious, but just negates some things like the average temperature of Earth being 0F if there were no greenhouse gases. One thing that is true is that the GCMs could produce results that violated the second law since computers just solve the equations that are programmed into them so can violate the laws of physics.