A study has found that polluting emissions from U.S. manufacturing fell by 60 percent between 1990 and 2008—a period in which manufacturing output grew significantly—primarily because manufacturers adopted cleaner production methods in tandem with increasingly strict environmental regulation.

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A study has found that polluting emissions from U.S. manufacturing fell by 60 percent between 1990 and 2008—a period in which manufacturing output grew significantly—primarily because manufacturers adopted cleaner production methods in tandem with increasingly strict environmental regulation.