This video has already been posted by the Devil's Kitchen and a few others, but I felt that it should be seen by as many people as possible. If you believe in man made climate change, I would ask you to please try and view this with an open mind, and then come to your own conclusions.
This video outlines man-made global warming theory due to greenhouse gasses. It then proceeds to demonstrate, mostly using historical evidence and actual data from the UN climate panel, why man's impact on world temperatures is unlikely to reach catastrophic levels. It concludes by showing the tremendous costs involved in reversing carbon dioxide production, and demonstrates why these costs may well outweigh impacts of man-made warming.