Arctic

Researchers know what killed Knut the polar bear

The cold town in Norway with the funny name

5 dangers of oil drilling in the Arctic Ocean

North Pole Marathon: Where the bitter cold slows you down and thoughts of polar bears make you go faster

Arctic sea ice 'thinning dramatically'

Sky turns psychedelic in must-see northern lights video

7 of the best aurora borealis videos from 2014

Arctic is heating up twice as quickly as rest of world

Pastel drawings look like photographs of Earth's epic battle with climate change

Photographer finds radiance in wildlife of Arctic tundra

8 trailblazing female explorers

Northwest Passage: The final frontier for cruise ships

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