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Megacities: Scars On The Earth, Or Keys To Growth?

Dec 12, 2011 (Talk of the Nation) — Critics have long derided the world's biggest cities as disorderly, overcrowded and polluted. But in recent years, as the planet's population continues to rise past seven billion and more and more people flock to urban areas, some now argue that cities may hold the key to sustainable growth.

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Steve Inskeep, host of NPR's Morning Edition and author of Instant City
Robert Kunzig, senior environment editor, National Geographic Magazine

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