1.) Host Bruce Robertson talks with Dr. Michael Clacke of the University of California Riverside, about a report by the National Academy of Sciences that discusses the importance of preserving the habitats of endangered species. 2.) Wendy Lutz talks with Bill McKiben about a book he recently edited, "Birch Browsings: A John Burrroughs Reader". 3.) Robertson talks with Mary Anne Marshowzer of the Nature Conservancy about a project she runs introducing urban children to nature.