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Scientists blamed the drowning polar bears retreat of Arctic ice - sea ice off the Alaskan coast has retreated northward 260 km, which means that polar bears have to swim a long
distance to find some solid ice.
Polar bears are not aquatic animals, their home in the sea ice. Under normal circumstances, the polar bear swim four, fifty kilometers is possible, but to travel 50-100 km, they probably would be difficult to secure landing, and there will be danger of drowning. So, good for swimming because the sea ice the polar bear is separated from the longer than their swimming ability and be drowned. Moreover, the long road leading to their exhaustion at sea foraging, body temperature decreased resistance rather weak, if you encounter a large sea waves, it is easy to be drowned in the sea.
Scientists believe the Arctic, polar bears drowned like this is very common, because nearly 20 years, with the Arctic ice are melting, polar bears are forced to find food long-distance number has increased significantly. If in the future to further melting of Arctic ice, polar bears such deaths will probably increase.
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