It is now widely believed that man-made greenhouse gases are causing an unnatural warming of the earth that will have devastating consequences for human life. Environmentalists and politicians are pressing for severe restrictions on greenhouse gas emissions in order to prevent climate change. But what does the scientific evidence actually support regarding the causes of climate variability and the role of anthropogenic greenhouse gases? Are the predictions of catastrophic changes supported by scientific fact? Are governmental economic intervention and restrictions on emissions an appropriate policy response? Drs. Keith Lockitch and Willie Soon address these critical issues and answer audience questions in a lively panel discussion. (Recorded April 13, 2009.)