Number of coral bleaching events, World

The number of moderate (up to 30% of corals affected) and severe coral bleaching events (more than 30% of corals)measured at 100 fixed global locations. Bleaching occurs when stressful conditions cause corals to expel their algalsymbionts.

198020161982198419861988199019921994199619982000200220042006200820102012201450Moderate (<30%)Severe (>30%)

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Number of coral bleaching events

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