Justin Asks: "I've wondered why there seem to be only two black and white camps on the issue. Isn't it possible that its both a natural long term cycle and some human influence at the same time? Why does it have to be either or?"
Climate scientists just look at data and try to figure out what causes climate change, acknowledge CO2 and natural effects both cause change, not either or.
Even Roger acknowledges CO2 increases temperature - 0.8C rather than 6C - due to negative feedback. But, for example, one of those negative feedbacks is the ocean has been absorbing CO2. At some point, it will become more saturated and absorb less, so the temperature will start increasing more. And there are positive feedback effects, like as it warms a little, methane will be released from the artic and deep ocean, which has even more of a greenhouse effect so temperature increase will accelerate.
We are living a huge science experiment. No one knows what the results will be. Better to at least take the easy steps to reduce CO2 emissions.
"If we weren't wasting billions on the co2 chimaera, we'd have a lot more resources to deal with the actual important pollution issues."
Fortunately, if we make more fuel efficient cars and buildings, use more windmills, burn less coal,... it will produce less CO2, Sulfur, Mercury,...