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Earth Day at 40: New Perspectives on the Planet's Health

April 22, 2010, marks the 40th anniversary of the original Earth Day. How far has the planet come in the intervening decades?

State of the Planet: A Snapshot [Audio Slide Show]

What is the state of our planet, its health and the impact humans have had upon it? Based on maps from the Atlas of Global Conservation, Scientific American brings you the global perspective on our planet in this multimedia presentation.

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Bill McKibben's Eaarth, Part 1

Writer and activist Bill McKibben talks to Scientific American's Mark Fischetti about his new book Eaarth: Making a Life on a Tough New Planet Part 1 of 2. Edited and produced by podcast host Steve Mirsky

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What's the Most Recycled Product in the U.S.?

It's not paper, plastic or even aluminum. David Biello reports

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