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©Science/AAAS |
Dead Zone: Waters with little or no oxygen continue to form in coastal areas worldwide thanks to fertilizer washing off agricultural fields and fossil fuel burning. |
More bad news for the world's oceans: Dead zones - areas of bottom waters too oxygen depleted to support most ocean life - are spreading, dotting nearly the entire east and south coasts of the U.S. as well as several west coast river outlets.
According to a new study in Science, the rest of the world fares no better - there are now 405 identified dead zones worldwide, up from 49 in the 1960s - and the world's largest dead zone remains the Baltic Sea, whose bottom waters now lack oxygen year-round.