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The Dutch mastered the sea but its reefs paid the price, so this company is printing new ones

Europe's longest dam has kept the Netherlands from flooding for almost a century, but it wiped out the marine life around it. Now a small Dutch company is 3D printing reefs to restore what was lost.

2:55 • Source: CNN
Call to Earth 15 videos
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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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• Source: CNN
<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
3:56
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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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A long-lost giant makes a remarkable return
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For the Ocean: Sylvia Earle and Titouan Bernicot
22:59
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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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Why scientists want ice from 600 meters below the surface
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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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• Source: CNN