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 extreme global warming have expanded, making them difficult to bring the food to the lack of food due to the loss of local housing. 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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