How much of the Great Barrier Reef is bleached?
Coral bleaching
In the 2012–2040 period, coral reefs are expected to experience more frequent bleaching events. The Intergovernmental Panel on Climate Change (IPCC) sees this as the greatest threat to the world's reef systems.[42][43][44][45] Coral reefs worldwide were lost by 19%, and 60% of the remaining reefs are at immediate risk of being lost. There are a few ways to tell the impacts of coral bleaching on reefs. First by the coral cover, the more coral that is covering the ground the less of an impact bleaching had. Second, coral abundance, which is the number of different living species on the coral reef.