Must extinction be forever? Advances in cloning and DNA sequencing have made recreating extinct species a real possibility. Several research groups around the world are now pursuing resurrections—from the Passenger Pigeon, which vanished a century ago, to the mammoth, which has been gone for millennia. Are these efforts stunts or ideas worth taking seriously? Stewart Brand proposed bringing back the Passenger Pigeon at last year’s Environment Forum, and since then he and Ryan Phelan have been exploring the possibility seriously. They’ll talk about the issues—and the hope and peril of technology generally—with Aspen Institute President and CEO Walter Isaacson.
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