Human Carbon Dioxide Thins Polar Ice, NASA Finds | Video

Tuesday, April 21, 2015 - 15:30 in Earth & Climate

Human activities greatly outstrip volcanoes as the world’s leading carbon dioxide producers, raising sea levels, drying forests and altering animal habitat. Watch ‘Secrets of the Universe’ on Hulu. http://www.hulu.com/secrets-of-the-universe

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