Coral Bleaching (IMAGE) Brown University Caption Coral bleaching has severely damaged or killed 30 percent of the world's coral reefs, turning brightly colored coral a ghostly white. Research shows that some Credit Photo: Jon Witman/Brown University Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.