What caused the mother of all extinctions 250 million years ago?
Examine a lineup of possible culprits in the Permian extinction, vote for your favorite, then see what paleontologist Doug Erwin thinks.
In this audio dispatch, hear why we shouldn't take Earth's hospitable climate for granted.
The Cosmic Perspective
Has Planet Earth reached a dead end? Maybe we should ask ourselves. Watch online.
Ask the Expert
The Smithsonian's Doug Erwin answers viewer questions about the Permian and other mass extinctions.
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