Christopher Joyce, National Museum Of Natural And NPR discussed on All Things Considered

Automatic TRANSCRIPT

There was a time when life on earth was almost wiped out. The great dying was the biggest extinction ever, it happened two hundred and fifty million years ago and was largely caused by greenhouse gases in the atmosphere. As NPR's Christopher Joyce reports scientists are beginning to see alarming similarities between the great dying and what's happening to our atmosphere. Now you can learn about the great dying at the new deep time exhibit at the national museum of natural history. I get a back door of visit by a giant freight elevator. That's used to haul life size dinosaurs up to the new hall.

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