From a relevant article:

In March, the Great Barrier Reef Authority said that aerial surveys on over 300 inshore, midshelf, and offshore reefs confirmed that “widespread, often called mass, coral bleaching event is unfolding” across the reef. A month later, the US National Oceanic and Atmospheric Administration’s (NOAA) and the International Coral Reef Initiative (ICRI) confirmed that the world is undergoing its fourth global coral bleaching event. It is the second in the past ten years. Among the 53 regions affected are Florida, Eastern Tropical Pacific nations including Mexico, El Salvador, Costa Rica, Panama, and Colombia, and Australia. According to the most recent report by the Global Coral Reef Monitoring Network (GCRMN), the world has lost approximately 14% of corals since 2009.