Bill McKibben tells Letterman why he's bringing solar back to the White House

Bill McKibben chats with David Lettermen about 350.org, his book Eaarth, and a new tour to bring rooftop solar back to the White House (Jimmy Carter installed panels; Ronald Reagan took them down; and students from Unity College in Maine, where they’ve been stored, are traveling to Washington to have them put back up). Hard worker, this guy:

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