Loading…

Peter Ward:
A theory of Earth's mass extinctions

TED2008 · 19:41 · Filmed Feb 2008
Watch next...
Martin Rees: Is this our final century?
arrow

Share this idea

792,302
Total views
TED Talks are free
thanks to support from

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

42 comments

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

2000 characters remaining
Don't have an account? Sign up now — it's fast and free.
Sort comments by
There are currently no comments for this talk.