This video illustrates that as mountaintop removal mining has become increasingly controversial across Appalachia, the debate over the fate of Coal River Mountain has become something of a symbolic line in the sand.

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This documentary presents how recent changes in the composition and quantities of African dust transported to the Caribbean and the Americas might provide clues to why Caribbean coral reef ecosystems are deteriorating and human health may be impacted.

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In this video, Ted Van Hyning, director of Event Technology at the Renaissance Hotel in Cleveland, Ohio, represents one of many businesses that are beginning to switch to LED lighting in their establishments.

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In this video, Ban Ki-moon, the United Nations secretary general, spoke with The Times's Andrew C. Revkin after climate change talks in Copenhagen concluded Saturday.

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Journey through the story of human evolution in a broadband documentary experience. Brought to you by the Institute of Human Origins, a non-profit, multidisciplinary research organization affiliated with Arizona State University, dedicated to the recovery and analysis of the fossil evidence for human evolution.

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