Here is his testimony in front of the Senate Energy Committee. He seems to be a legit scientist that can not simply be dismissed as a fringe loon. If you like read and reply. I agree with what he says and this proves that there are actual scientist that disagree with man made climate change.
I also read that green house gases make up 3%of the atmosphere and that 2% of that is CO2 and that 2% of that is man made. It is hard to imagine that such a minute amount of the atmosphere would have this much effect on our climate.