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Audubon looks at the positive results from the Clean Water Act passed in 1972. The report finds that the landmark law has "spurred an unprecedented cleanup of the nation's waters," and tells the success stories of several big rivers' cleanup. The article reveals also that much remains to be done and points to an Environmental Protection Agency report showing that "forty percent of the nation's surveyed rivers, lakes and estuaries are too polluted for basic uses."
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