Great Barrier Reef

FILE - In this Jan. 23, 2006 file photo provided by Centre of Marine Studies, The University of Queensland, fish swim amongst bleached coral near the Keppel Islands in the Great Barrier Reef, Australia. Ocean acidification has emerged as one of the biggest threats to coral reefs across the world, acting as the "osteoporosis of the sea" and threatening everything from food security to tourism to livelihoods, the head of a U.S. scientific agency said Monday, July 9, 2012. (AP Photo/Centre for Marine Studies, The University of Queensland, Ove Hoegh-Guldberg, File)

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Australia's Great Barrier Reef — the world's largest coral reef ecosystem, chock-full of diverse marine life-- is also in steep decline, with half of the reef vanishing in the past 27 years, according to new research.

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