Episode 2: Is it time we let some species go extinct?

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With more than half of the world's species threatened with extinction this century, conservation scientists are faced with a very real dilemma:  Is it time to let some species go?  Should we pick winners and losers, and focus our efforts on the species that have the best chance of survival, even if that means giving up on others?  It's a Tooth and Claw debate. 

Australian scientist and "triage" advocate Hugh Possingham squares off with Duke University's Stuart Pimm.  We also get the Canadian perspective from York University's Bridget Stutchbury.

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