If you all don't watch the Colbert Report, his guest on September 10th was Bjørn Lomborg. Bjørn explained how global warming is a problem, but not the most important one. His best example was this: Scientists explain that because the Earth's temperature is rising, mosquitoes will flourish causing Malaria cases to rise as well. But if we were to spend only a fraction of the money we would have spent on global warming we would save 30,000 to every 1 we saved through bringing homeostasis to the Earth's climate.
During the interview Bjørn also explained with some degree of difficulty through Stephen's shenanigans that the Earth's temperature has been rising for quite some time, even before the Model T Ford came to existence. He's selling a book, which I will probably not read, called "Cool It! The Skeptical Environmentalist's Guide to Global Warming" which calls for us to keep global warming in mind but to focus mainly on issues that are of much more importance.
http://www.amazon.com/Cool-Skeptical-Environmentalists-Global-Warming/dp/0307266923If you're interested.
Oh.. and according to him the polar bears are fine.