Volume 18, Issue 1, Pages R18-R21 (January 2008) Coral reefs  Nancy Knowlton  Current Biology  Volume 18, Issue 1, Pages R18-R21 (January 2008) DOI: 10.1016/j.cub.2007.11.018 Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 1 Aerial view of the coral reefs of Heron Island, Great Barrier Reef, Australia. Photo courtesy of Ove Hoegh-Guldberg. Current Biology 2008 18, R18-R21DOI: (10.1016/j.cub.2007.11.018) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 2 Diversity of coral growth forms. Photo courtesy of Ove Hoegh-Guldberg. Current Biology 2008 18, R18-R21DOI: (10.1016/j.cub.2007.11.018) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 3 A partly bleached coral. The coral is still alive, but the polyps in the bleached parts have lost their symbiotic algae. Photo courtesy of David Kline. Current Biology 2008 18, R18-R21DOI: (10.1016/j.cub.2007.11.018) Copyright © 2008 Elsevier Ltd Terms and Conditions