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A new aerial survey of some five hundred sites on the northern part of the Great Barrier Reef off Australia shows such serious damage that scientists warn a large number of corals could die within the next few months. Ove Hoegh-Guldberg is professor of marine sciences and director of the Global Change Institute at the University of Queensland. (Photo: Bleached coral reef located between Cairns, Australia, and Papua New Guinea. Credit: European Photopress Agency)