Chaps...we've hit this subject quite a few times. Search it up. As part of my Honors Majors Biology II course I was required to do a symposium on Global Warming based off of research found in a book called
State of Fear by Michael Chricton. He provided sources for all of his materials and he provides a damn good case.
Any retort of his book involved "he has no credibility" or "he's an idiot" b/c that's the best anybody has against the information he provided. In short, with just the information you'll find in that book you'll probably conclude that Global Warming is not only blown way out of proportion, but even something we shouldnt be concerned about. In addition to that, most green movement postulations are overblown, wrong, or dangerous. In fact, I'd go so far as to say that the green movement has been one of the largest disasters for human life (yes, human life) of the past century! The world-wide [near] banning on DDT, a pesticide that is "common knowledge" dangerous but laboratory proved safe, has resulted in MILLIONS of deaths per year in 3rd world countries b/c it was the only good line of defense to mesquito-born malaria we know of! Just recently, a couple years back, South Africa finally said F U to the world and started using DDT again b/c they had a 50 fold increase in deaths after it was removed from the country. The worst it has been proven to do is bioaccumulate in some animals, such as fish
Read the book or get the audio CD's.