Warmer weather will most likely make it impossible for polar

Warmer weather will most likely make it impossible for polar bears to survive on the shoes of Hudson's Bay,Canada,in 20to 30years.So says the worlds 'best _known polar expert,lan Stirling,Who has studied polar bears as a biologists for 41years_longer than anyone else in the field.The loss of Arctic ice is the main thret to Canada 's southern _most polar bear populations.An estimated 1,600 bears live in the region,according to satellite images.Stirling said,"that's faster than most scientific models 翻译