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Coral reef off Dahab in the Red Sea in Egypt showing signs of coral bleaching.

Coral reef off Dahab in the Red Sea in Egypt showing signs of coral bleaching. Like many areas of coral around the world they are increasingly threatened by global warming indiuced coral bleaching. Bleaching is caused when the water temperature rises to a point that the Zooxanthellae can not tolerate. These symbiotic algaes can recover if the water temperatures drop but prolonged heat will eventually kill the coral.