If the most dire climate predictions come to pass, the Arctic ice cap will melt entirely, and polar bears could face extinction.So why not pack a few off to Antarctica, where the sea ice will never run out?
It may seem like a preposterous question. But polar bears are just the tip of the "assisted colonization" iceberg. Other possibilities: moving African big game to the American Great Plains, or airlifting endangered species from one mountaintop to another as climate zones shrink.
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