Bill McKibben on a Tough Planet

Bill McKibben sounded the alarm about global warming over twenty years ago in his book, "The End of Nature." His new book is "Eaarth" (yes, spelled with 2 "a"s) and lays out a model of how to survive on our changed planet: think small and local. He talks with Anne Strainchamps about the changes to come and what we can do about them.