in this documentary on the green economy. As many environmentalists see it, the future of energy is not in greenhouse gas-emitting fuels like oil and coal -- whose supply is running out -- but in sustainable, clean sources like wind, sun, tide and the enormous storehouse of heat that naturally occurs deep underground. In the coming green economy, utilizing this energy will generate a surge of new employment, while combating climate change and providing additional energy independence for the United States. This program places the green economy in the context of American environmental history (including audio of Rachel Carson, the first Earth Day and President Carter's far-sighted 1977 energy address) and features contemporary voices, including "The Green Collar Economy" author Van Jones, in the new effort to protect the planet by relying on sustainable sources of energy. The second half-hour explores the fascinating movement among religious congregations, liberal and conservative, to address global warming.