1) Steven Westcott and Dan Chang, professor of Environmental engineering discuss the health risks of Methyl Tertiary Butyl Ether (MTBE)s in ground water. 2) Peter Berle speaks with John Moulder, oncologist and Libby Kelly with the Council on Wireless Technology about the environmental and health risks of cell phone towers. 3) Peter Berle discusses the American national park system. 4) Steven Bodio reads from his book, On the Edge of the Mind: Passions and Pleasures of a Naturalist. 5) Peter Berle and Dr. Stephen Kress discuss the success of the puffin project in Maine. 6) Linda Anderson presents a segment highlighting tensions in Gramercy Park where resident Aldon James protests the removal of trees. 7) Peter Berle speaks with Tim Townsend of the University of Florida, Peter Yost of the Homebuilders Research Center and Nevin Cohen of Inform Inc. about recycling, construction waste and the state of landfills. 8) Callers.