The mystery of the PETM might be the methane after all:
http://www.sciencedaily.com/releases/2011/11/111109111542.htm
More on the PETM:
http://ngm.nationalgeographic.com/2011/10/hothouse-earth/kunzig-text
http://www.sciencedaily.com/releases/2011/11/111109111542.htm
More on the PETM:
http://ngm.nationalgeographic.com/2011/10/hothouse-earth/kunzig-text
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