A brood of young waterfowl find a perch in the middle of the 18-acre wetland on a farm in southern Minnesota’s Freeborn County. Wetlands filter pollution from water and help control flooding. Economist Steve Polasky is working to assign a dollar value to wetlands and other aspects of nature that benefit people. (MPR File Photo/Dan Olson)

U of M economist measures nature’s benefits with dollars | Minnesota Public Radio News.

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