The Global Warming issue is actually quite ambiguous. It is very hard to separate any signal that CO2 is causing climate change from all of the noise in the temperature and other weather data. The IPCC and the proponents of greenhouse gas induced climate change have caused a lot of the vigorous disagreement because of their attitude that opposing viewpoints should be suppressed, and that draconian action is required due to their adherence to the "precautionary principle." Here is a rational discussion of the issue in an interview of climatologist Dr. Robert Balling, Jr.

http://dotearthaction.wordpress.com/our-actions/talking-back-to-inactivist-on-call-in-radio/transcript-of-dr-robert-c-balling-jr-call-in-part-i/