Polar bears are going to become extinct due to the fact that cubs are not surviving into adulthood. The lack of food is leading to cubs to become skinny and unable to survive for themselves making them more likely to die. Also, adult male polar bears have turned to cannibalism to survive, eating other polar bears to store more food and live. Polar bears that are surviving sometimes die on the swim to get to the ice caps to hunt for food. Ice is forming further and further away from shore making polar bears having to swim further, because polar bears already don't have enough stored energy the swim there has killed many.
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