This week on Sierra Club Radio: 1) Paul Krugman, renowned New York Times columnist and author of a new book, The Conscience of a Liberal. 2) Jen Hattam gives green tips for heating water in your home without wasting energy. 3) A political update from Carl Pope, the Sierra Club's Executive Director. 4) Cindy Kang, Associate Director for Green Corps, the field school for environmental organizing 5) Fran Pavley, the woman behind the landmark legislation to reduce global-warming emissions from cars.