I highly suggest everybody check out the movie/doc 'the great global warming swindle' - it discusses the other side of this argument presented in an inconvenient truth. It doesn't dispute the fact that global warming is happening, but that CO2 increases are not the cause, rather, the effect, of global warming. There is a lot of scientific evidence presented in it. You can watch it on youtube or download it. Quite controversial, but nice to hear the other side of the argument.