Loading…

Peter Ward:
A theory of Earth's mass extinctions

TED2008 · 19:41 · Filmed Feb 2008
Subtitles available in 21 languages
View interactive transcript
722,083 Total views
Your impact
Share this talk and
track your influence!

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.

Paleontologist
Peter D. Ward studies life on Earth — where it came from, how it might end, and how utterly rare it might be. Full bio
This talk was presented at an official TED conference, and was featured by our editors on the home page.

Discuss

41 comments

Enthusiastically agree? Respectfully beg to differ? Have your say here.

2000 characters remaining
Please or sign up to add comments.
Sort comments by
There are currently no comments for this talk.