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Natural World: Penguins of the AntarcticPenguins are true survivors, but how will they cope with greatest challenge yet, climate change?![BBC Earth]()
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The Natural World: Polar Bears and Grizzlies: Bears on Top of the WorldA look at the differing fortunes of a mother polar bear, a mother grizzly bear and their cubs, in a rapidly changing world; the shrinking Arctic ice is making life tougher for polar bears, but it is offering new opportunities for grizzly bears.