The best thing to do is to ignore what the government and newspapers say the scientific evidence is and go straight to relevant journals. If you're interested in the subject then Environmental Chemistry would be a good place to start but to my knowledge the vast majority of scientists who specifically study the climate do think that human activity is having a significant effect on the levels of things like carbon dioxide.

Personally I don't think there's any argument that we're producing far too much carbon dioxide, virtually everything we do produces it including breathe. Whether or not that translates into global warming I don't know, I certainly don't think it's doing any good.