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Human activities are affecting every square mile of the world's oceans, according to a study by a team of American, British and Canadian researchers who mapped the severity of the effects from pole to pole.
The analysis of 17 global data sets, led by Benjamin S. Halpern of the National Center for Ecological Analysis and Synthesis in Santa Barbara, Calif., details how humans are reshaping the seas through overfishing, air and water pollution, commercial shipping and other activities. The study, published online yesterday by the journal Science, examines those effects on nearly two dozen marine ecosystems, including coral reefs and continental shelves.
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