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Australia's Great Barrier Reef is hit with mass coral bleaching yet again

Australia's Great Barrier Reef has experienced four mass bleaching events in the last seven years, like this one in 2017. Scientists warn repeated bleaching makes it tough for corals to recover. (Getty Images)
Australia's Great Barrier Reef has experienced four mass bleaching events in the last seven years, like this one in 2017. Scientists warn repeated bleaching makes it tough for corals to recover. (Getty Images)

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