In an undated file photo, 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. (AP Photo/Minnesota Public Radio, Dan Olson)
Read the article: Economist tries to place a dollar value on nature
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