Is Earth Warming?

This video is part two of a seven-part National Academies series, Climate Change: Lines of Evidence. The video outlines, with the use of recent research and historical data, how we know that the Earth is warming.

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National Research Council
The National Academies
Video length 4:37 min.

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Whole series is here: [link http://www.youtube.com/playlist?annotation_id=annotation_392971&feature=...