1.) Host Peter Berle discusses the environmental activism of corporations, including the Nature Company, Sebastian, and Stonyfield Farm. 2.) In the segment Locking Horns, Cindy King of the Sierra Club and Frank Harkenrider, mayor of Hermison, Oregon, debate the issue of chemical weapons incineration. 3.) Thomas Lalley talks with Harold Mayfield, an expert on Kirtland's Warblers, about the endangered species that is making a comeback. 4.) In the segment Portrait of a Place author David Grimes discusses the various rivers that have impacted his life. 5.) In the segment Earth Calendar Berle talks with John Neeshi, a biologist, about the mating rituals of the musk ox.