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Why scientists want ice from 600 meters below the surface

Braving weeks of sub-zero temperatures and 24-hour sunlight, an international team of researchers gathered in the Canadian High Arctic to collect and study ice cores.

3:58 • Source: CNN
Call to Earth 15 videos
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Why scientists want ice from 600 meters below the surface
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<p>The global sunflower sea star population has been decimated over the past decade, pushing North America's kelp forests toward collapse. We look at how captive breeding at the Sunflower Star Laboratory and conservation efforts by the Kashia Band of Pomo Indians are helping save the species.</p>
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The race to save this 'pizza-sized' sea star
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Koalas are good hiders. Here's how you find them
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A health check for whales — from the sky
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The 'end of an era' for Coral Gardeners
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Puget Sound seal pups on the road to recovery
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Super-boosting coral reefs as El Niño looms
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The Dutch mastered the sea but its reefs paid the price, so this company is printing new ones
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A long-lost giant makes a remarkable return
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For the Ocean: Sylvia Earle and Titouan Bernicot
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For more than a century, National Geographic has brought the world's greatest discoveries into our homes. Now, a new museum in Washington, DC, is inviting visitors on an immersive journey into the world of exploration, conservation and storytelling.
Inside the National Geographic Museum of Exploration
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Reforesting Rio de Janeiro
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Saving the Amazon's Stingless bees
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Call to Earth: Reviving India's waters
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Bearded vulture on the brink: Conservationists in South Africa and Lesotho race to save this raptor
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