Johnathan Blair / National Geographic

A museum worker inspects a replica of a woolly mammoth, a species that went extinct 3,000 to 10,000 years ago. In March 2012, scientists in Russia and South Korea announced a partnership to try to clone the mammoth and generate a living specimen.

By Alan Boyle, Science Editor, NBC News

If scientists can use genetic engineering to bring back the woolly mammoth, should they do it? How about the passenger pigeon? Or the western black rhino? Do we humans have a responsibility to restore at least some of the species that our ancestors wiped out? And if we bring them back, will they really be the same?

Such questions are the focus of TEDxDeExtinction, a public forum that's being presented on Friday from 8 a.m. to 5 p.m. ET at National Geographic's Washington headquarters. You can watch the whole thing online via LivestreamTEDx and National Geographic's De-Extinction website, which also has loads of articles and resources on the issue. The event has been organized by Revive & Restore, a nonprofit clearinghouse for worldwide de-extinction work that's under the aegis of the Long Now Foundation in San Francisco.

"De-extinction"? What's that?

"It's using new technologies like cloning and genome sequencing to reconstruct a species that went extinct," science writer Carl Zimmer explained. Zimmer's talk at Friday's TEDx event will help set the scene for the de-extinction debate, and he's also written a cover story on the topic for National Geographic's April issue.

National Geographic

National Geographic's cover story for the April issue focuses on the prospects of reviving ancient species.

De-extinction has been in the works for more than a decade, basically ever since Dolly the Sheep demonstrated in 1996 that mammals could be cloned from cells in a lab dish. Spanish and French scientists worked for years on an effort to bring the Pyrenean ibex back from extinction, by cloning cells that had been preserved from the last known animal of the species. They succeeded only in producing a deformed kid that died 10 minutes after birth.

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Should we revive extinct species? Watch experts debate de-extinction

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