Guys - "Follow the SCIENCE!!!"
Polar Bear populations are high now, because global warming is making it easier for them to find food and survive mild winters.
Soon, they will be extinct, because they will all, simultaneously, jump on a piece of floating glacier. This piece of ice will take them to the tropics where they will, ultimately, not be able not be able to compete with 3-toed sloths for prey (Pacific polar bears).
The Atlantic polar bear, will, for sure, be doomed because their piece of glacier will end up on a beach in Central Africa. There, they will have to compete with lions and leopards for prey.
(If you want to continue to be a good global citizen, I recommend taking Atlantic polar bears first, since they will be the first that are surely doomed to extinction)
You should be able to hunt Pacific polar bears in Costa Rica until at least 2200 AD.