Bringing back lost species?

The Thylacine (Thylacinus cynocephalus). Dr. Goding in 1902. Source: Wikipedia.

Throughout humankind’s history, we’ve driven species after species extinct: the passenger pigeon, the Eastern cougar, the dodo, the Tasmanian tiger …

But now, says American writer Stewart Brand, we have the technology (and the biology) to bring back species that humanity wiped out. So — should we? Which ones? He asks the big question. The answer is closer than you might think.