1.) Host Bruce Robertson talks with Dr. Caran Sing of the People's Commission on Environment and Development in India, about his upcoming trip to the U.N. Earth Summit. 2.) Dr. Jack Winnick discusses his recent discovery of electro-chemical membrane gas separation a filtration system that could help decrease acid rain. 3.) Robertson talks with cellist Michael Reynolds of the Muir string quartet about their music and environmental work. 4.) Robertson checks in with Keith Tondrick of the Sierra Club to find out about the Appalachian Trail Hike.