U.S. coral reefs under threat, report finds
Half of U.S. coral reefs are in poor or fair condition, threatened by climate change and human activities like sports fishing, shipping and the release of untreated sewage, a U.S. government report has said. Reefs in the Caribbean, in particular, are under severe assault and coral in the U.S. Virgin Islands and off Puerto Rico had not recovered from 2005, when unusually warm waters that led to massive bleaching and disease killed up to 90 percent of the marine organisms on some reefs.