1.) Host Bruce Roberston talks with Roy Spencer, a space scientist with NASA, about recent weather pattern changes, including the eruption of Mount Pinatubo, and their connection to global warming. 2.) Robertson talks with John Jester of Renew America about their recent publication of the Environmental Success Index which lists businesses and organizations that are environmentally friendly. 3.) Sabine O'Hara gives her overall assessment of the Earth Summit in Rio de Janeiro. 4.) Robertson checks in with Sierra Club on-trail coordinator Tersh Palmer, to see how their Appalachian Trail hike celebrating the 100th anniversary of the Sierra Club, is going.