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