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Earth's mass extinctions: Peter Ward on TED.com

Asteroid strikes get all the coverage, but “Medea Hypothesis” author Peter Ward argues that most of Earth’s mass extinctions were caused by lowly bacteria. The culprit, a poison called hydrogen sulfide, may have an interesting application in medicine. (Recorded February 2008 in Monterey, California. Duration: 19:42.)

Watch Peter Ward’s talk on TED.com, where you can download this TEDTalk, rate it, comment on it and find other talks and performances from our archive of 360+ TEDTalks — including more bold predictions and stern warnings.

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