Nearly a third of the Great Barrier Reef has died
The great barrier reef is suffering a huge coral die-off.
New surveys show coral bleaching has led to 29 percent of coral dying in 2016. Bleaching happens when algae living in the coral comes out, turning the coral white. It's caused by stress from extreme sustained temperature changes.
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More coral die-offs are expected in 2017 from bleaching.
Experts say that climate change is a big factor in the coral loss and say we don't have much longer to curb the destruction of the reef.
