Podknife - Trees Write Air Pollution Record In Wood by 60-Second Earth

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Trees Write Air Pollution Record In Wood

Podcast |: 60-Second Earth
Publisher |: Scientific American
Media Type |: audio
Podknife tags |: Natural Sciences,; Science & Medicine,; Society & Culture,; Technology
Categories Via RSS |: Science & Medicine,; Society & Culture,; Technology
Publication Date |: Sep 08, 2013
Episode Duration |: 00:01:36

The red cedar trees of West Virginia reveal just how effective U.S. clean air laws have been. David Biello reports

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