In this April 13, 2012 photo released by The Nature Conservancy, coral grows in a coral reef nursery as part of a Caribbean coral reef restoration program off Cane Bay, St. Croix, U.S.

 

              In this April 13, 2012 photo released by The Nature Conservancy, coral grows in a coral reef nursery as part of a Caribbean coral reef restoration program off Cane Bay, St. Croix, U.S.
In this April 13, 2012 photo released by The Nature Conservancy, coral grows in a coral reef nursery as part of a Caribbean coral reef restoration program off Cane Bay, St. Croix, U.S. Virgin Islands. Across the globe, reefs that have proven resilient for thousands of years are in serious decline, degraded by over fishing, pollution, coastal development and warming ocean waters. And threats to coral are only expected to intensify as a result of climate change and ocean acidification due to greenhouse gases. (AP Photo/The Nature Conservancy, Kemit-Amon Lewis)