A theory of Earth's mass extinctions

Title:: A theory of Earth's mass extinctions
Speaker:: Peter Ward
Description:: 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.

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Video Language:: English
Team:: closed TED
Project:: TEDTalks
Duration:: 19:18

	TED2 changed primary url from https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4 to https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4
	Daban Q Jaff approved Kurdish subtitles for A theory of Earth's mass extinctions
	Daban Q Jaff accepted Kurdish subtitles for A theory of Earth's mass extinctions
	TED2 changed primary url from https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4 to https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4
	TED2 changed primary url from https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4 to https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4
	TED2 changed primary url from https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4 to https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4
	TED2 changed primary url from https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4 to https://s3.amazonaws.com/ted.conferences/talk/transcript/2008/None/PeterWard_2008-transcript.mp4
	mabbast chato edited Kurdish subtitles for A theory of Earth's mass extinctions