#155 The Great Environmental Debate: Charles C. Mann

Our guest, journalist, Charles C. Mann, author of new book, "The Wizard and The Prophet", is a correspondent for The Atlantic, Science and Wired. Two of his previous books, 1491 and 1493, were widely-acclaimed best sellers.

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#148 The World Is Getting Better: Gregg Easterbrook

Our guest, journalist Gregg Easterbrook is author of the new book, "It's Better Than It Looks: Reasons for Optimism in an Age of Fear."

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