Walt Meier says that the Arctic was ice-free in summer 5,000 years ago. According to our expert understanding, that means the bears went extinct across the Arctic.
Also, every summer the Hudson Bay is ice-free for several months, so we can say for certain that every summer the Hudson Bay bear population goes extinct.
Pal reviewed literature shows that polar bears used carrier pigeons to deliver seal meat to them during warm periods of the past. Now that we have killed off all the carrier pigeons, the bears will die.
Polar bears have been long extinct due to constipation, having searched hard for woods in the Arctic where to defecate in.