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Coal combustion is the largest source of carbon dioxide emissions on the planet. But the fuel isn't going away anytime soon, since demand for it is ballooning in the developing world. So instead of indulging in quixotic visions of a coal-free world, policymakers should focus on supporting new technologies that can reduce how much carbon coal emits.

* Running time: 12:55 * Aired: January 2008 Draft 85 * Description: Discusses how biofuels (such as ethanol) is not very cost efficient or environmentally friendly. How using corn for fuels affects the food supply of the world is also discussed. * Rating: Very Good * 7-Revolutions: Technology, Resources

NOVA - Car of the Future: Engineering for the Environment * Released April, 2008 * Running time: 54 min * Description: This documentary is hosted by the radio hosts for NPR's program, Car Talk. The hosts Tom and Ray visit several manufacturers and entrepreneurs who are creating more efficient, eco-friendly cars, such as new versions of hybrids, hydrogen fuel cells, and electric cars. The hosts add some humor that makes the documentary more enjoyable for students, while discussing serious issues. * It can be viewed in six different parts at: PBS.org - specifically: http://www.pbs.org/wgbh/nova/car/program.html * Rating: Very good * 7-Revolutions Section: Technology

* Running Time: 4:45 * Aired: May 2007 * Description: John Stossel from ABC 20/20 discusses the myths and problems that come from using ethanol as fuel. * Rating: Good * 7-Revolutions: Technology, Resources.