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Visual comparisons of a map by the United Nations Environment Program World Conservation Monitoring Centre (UNEP-WCMC), the leading global coral reef map, and the GDCS coral reef extent map in different regions, including (a) Great Barrier Reef (GBR), Australia, Papua New Guinea, Indonesia; (b) Madagascar, East Africa; (c) Red Sea, Samoa, Virgin Islands. Credit: Center for Global Discovery and Conservation Science at Arizona State University
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Nearly 75% of the world's coral reefs are under threat from global stressors such as climate change and local stressors such as overfishing and coastal development. Those working to understand and protect coral reefs are building the know-how to mitigate the damage but doing so requires first knowing where reefs are located. 

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