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Australia’s Great Barrier Reef has been severely damaged over the years, as widespread bleaching caused by rising temperatures and climate change negatively impact the structure. Now, a new study has put a firm figure on just how much of the reef has been lost over the past 25 years. A staggering 50%.

The research, published in Proceedings of the Royal Society, looked at coral communities and the size of the colony between 1995 and 2017 and found that nearly all of the coral populations suffered depletions of various amounts.

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