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Watch Vanguard online: Episode 4 I Heart Global Warming

Global warming is having a greater impact in the Arctic than anywhere else in the world. Greenland, the cold, harsh land that defeated the mighty Vikings is now facing a force that may destroy its defining feature -- ice. But while Greenland's melting ice sheet may mean chaos for the rest of the world, Adam Yamaguchi finds Greenlanders have some surprising reactions to this climatic upheaval.

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