Earth's mass extinction - Peter Ward

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View full lesson: http://ed.ted.com/lessons/earth-s-mass-extinction-peter-wardAsteroid 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.Talk by Peter Ward. Learn more about your ad choices. Visit megaphone.fm/adchoices

Episode metadata supplied by the publisher feed · Published Aug 13, 2026

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Earth's mass extinction - Peter Ward

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