Aside from the "big government" angle, Congress has no place making legislation about Anthropogenic Global Warming anyway, since it probably isn't even happening.
I have a pretty good science education, and I have looked deeply into this subject. Contrary to popular belief (what "everybody knows"), the actual evidence for it is so thin as to be pretty laughable, and there is quite a bit of evidence to the contrary. Keep in mind here that I'm not saying the globe isn't warming... it has been trending steadily warmer for over 6,000 years. What I am saying is that whether WE (the "anthropogenic" part) are causing it -- ANY of it -- via CO2 emissions is still very much questionable, and has become more questionable with every year that has passed since the alarmists made it a household phrase.
Also contrary to what some news agencies have stated, the researchers who claimed to have "proved" AGW (Michael Mann, Phil Jones and others), who have been under investigation for shoddy science ever since the email "leak", have not been absolved of wrongdoing. On the contrary, their respective universities have stated that further investigation is necessary, which will take some time. The UK government has announced that it will be performing its own independent study of the data, which they expect to take about 3 years.
Remember too that there is big money to be made on energy legislation. Some of Al Gore's companies alone stand to make a fortune if "cap and trade" is ever passed. Imagine that. What an amazing coincidence.