The Great Barrier Reef — Australia’s iconic coral reef that is so big, it can be seen from space — is not in good shape. New research shows that in the past 30 years, half of the coral in the reef has died.

What happened to it? Read this blog post by Nancy Knowlton, the head of ocean science at the Smithsonian, and see her PBS interview.

(via The Great Barrier Reef – Going, Going, Gone??? | Ocean Portal | Smithsonian)

Photo Credit: Christopher Schoenbohm

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