I love the fact that it's the most pro-free market people who most deny the Greenhouse effect. It shows that, like all other political issues, what stand one takes on this it has nothing whatsoever to do with facts.
No, it shows that the most pro-free market people tend to be smart enough to know that CO2 and global average temperature both happen to be going up right now is a coincidence. Also, there is no evidence for global warming south of the equator. Also, I would like to argue that even if global warming is caused by CO2 increase, wouldn't the whales contribute more the global warming than humans would?