An anonymous reader quotes a report from NPR: A new study based on four years of diving on 159 reefs in the Pacific shows that reefs in four countries -- Australia, Thailand, Indonesia and Myanmar -- are heavily contaminated with plastic. It clings to the coral, especially branching coral. And where it clings, it sickens or kills. "The likelihood of disease increases from 4 percent to 89 percent when corals are in contact with plastic," researchers report in the journal Science. Study leader Drew Harvell at Cornell University says the plastic could be harming coral in at least two ways. First, bacteria and other harmful microorganisms are abundant in the water and on corals; when the coral is abraded, that might invite pathogens into the coral. In addition, Harvell says, plastic can block sunlight from reaching coral. Based on how much plastic the researchers found while diving, they estimate that over 11 billion plastic items could be entangled in coral reefs in the Asia-Pacific region, home to over half the world's coral reefs. And their survey did not include China, one of the biggest sources of plastic pollution.