Global warming causes temperatures to rise, ice sheet began to melt. Reduce the size of the ice sheet down to which of these is the housing of animals, especially these polar bears. When a State global warming makes them scarce food due to the loss of local housing. Polar bears that live on the ice surface, it makes the ice sheet is hard to find. When the ice sheet melts is very rare. The creation of the bear's fat storage during the summer and autumn to hibernate during the winter, it will be less and the loss of energy in swimming, a lot may be causing the drowning death of the polar bears. The ice sheet that had a chance to break easily, making the bears hunt seals in these more difficult. As a result, female receives insufficient nutrients The child mortality rate is born is high.
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