I don't believe in it either. I don't think we have enough data to get in such a panic as people do. We should definatly try to limit our effect on the planet but I don't have much respect for the doomsday theorists. Have you heard of 'global dimming'? I saw a program about it the other day. According to some scientists, appearantly the planet is getting darker (and at the same time warmer) and this will cause multiple oppurtunities for a slow and painful death for all of mankind.