Okay, this isn't as exciting as it may seem, but I've been wondering what it would take to keep certain species from going extinct.
Primarily the thylacine. The thylacine (otherwise known as the Tasmanian tiger or wolf, for those that don't know) was a carnivorous marsupial that lived in Australia. The last known living specimen was captured in 1933 and placed in the Hobart Zoo, where it lived until 1936.
The thylacine has always fascinated me, and I think the Aussies really lucked out when this animal vanished (although some theorists might argue it still exists, I tend to go with the facts).
What would it take to save this species up until the present day, if not longer? It supposedly was extinct on the Australian mainland before European settlement, due to the invasion of the dingo. But it is unlikely the two species were often in competition (the thylacine was a nocturnal hunter whereas the dingo hunted during the day). Their exitinction on Tasmania is attributed to sheep farmers who put out bounties. What POD would be needed for this animal to survive? Is it possible for it to flourish once more, or would be destined to become like the South China tiger or Javan rhino, with very, very few individuals left?