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Last american polar bears, will be right back. This is a special edition of nightline, vanishing ice the last american polar bears. On the pure white ice they are almost invisible, an enduring. Of the wild arctic. But in recent years the polar bears come to embody something else. A creature caught in a changing world thats disappearing under its feet. There are less than 25,000 polar bears left in the wild, and few ever encounter them. But each year dozens descend on this isolated alaskan village. Were going on a journey to the edge of the earth to understand whats pushing these elusive beasts closer to people. Youre going to fly right over the Arctic Circle up to Barter Island. Hi. This is day 3 of travel. And we have our fingers crossed because were hopeful that were actually going to get up there today to see the polar bears. Here we go. Well check our latitude on the gps. And yes, we have just crossed the Arctic Circle. So the burks range is up ahead. Theyre extremely rugged, as yo

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