Fighting to protect a species is one thing, but what if that species is all but gone, can you bring it back?  Should you? Or, as Holly Doremus and Josh Donlan argue, have we already changed our world so dramatically that the only way forward is to accept that nature will never be how it was?  And Gisella Caccone explains how, at least on Pinta Island, we may be able to take the past and raise it from the dead.