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A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.
Slideshow

Two Views of Coral Reefs: Thriving and Threatened

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A screenshot from the video of Nancy Knowlton on PBS NewsHour.
Video

Where did Half of the Great Barrier Reef's Coral Go?

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Nuclear bomb in Bikini Atoll
Article

Naturally Resilient

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Two nurse sharks hover over a baited cage
Lesson Plan

Treasures in Jeopardy

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Two nurse sharks hover over a baited cage
Lesson Plan

Caution! Do Not Bleach

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Screenshot from video "Connecting Coral Reefs" showing illustrations of an underwater coral community.
Video

Connecting Coral Reefs

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A coral reef covered by silt and sand in the Western Pacific Ocean.
Photo

Coral Reef Covered by Silt and Sand

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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
Photo

Unhealthy Coral Reef, Kiritimi, Line Islands

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a display case of red coral jewelry containing necklaces, earrings, bracelets, and rings
Photo

Avoid Coral Jewelry

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Colorful corals are disappearing in the Great Barrier Reef.
Photo

Coral at the Great Barrier Reef

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Red coral necklaces in a display window. Harvesting deep-sea coral to produce jewelry like this threatens these ecosystems.
Photo

Coral for Sale

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Compare the healthy coral on the left with the bleached coral on the right.
Photo

Bleached Corals, Pacific Ocean

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