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Jeffrey Sachs may be the only economics professor who has his own MTV video -- documenting his trip to Africa with Angelina Jolie -- and he continues to be a leading voice promoting solutions to global poverty and environmental crises. He joins us to talk about his book, "Common Wealth: Economics for a Crowded Planet." Sachs is director of the Earth Institute at Columbia University and special adviser to United Nations Secretary General Ban Ki-Moon on the Millennium Development Goals. Host: Michael Krasny More Info: About the book "Common Wealth: Economics for a Crowded Planet": at Amazon.com