Algae-coated dead coral on the first dive of the Spring 2016 expedition to Christmas Island's south reef. In this view, only one small coral is still alive: a half-bleached, half-dead Porites colony in the lower left. Credit: Kim Cobb.

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Algae-coated dead coral on the first dive of the Spring 2016 expedition to Christmas Island's south reef. In this view, only one small coral is still alive: a half-bleached, half-dead Porites colony in the lower left. Credit:  Kim Cobb.