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机译:Estimating watershed degradation over the last century and its impact on water-treatment costs for the world's large cities
Global Freshwater Program, New York, NY 10001 USA;
Nature Conservancy, Global Cities Program, Arlington, VA 22203 USA;
Yale Univ, Yale Sch Forestry & Environm Studies, New Haven, CT 06511 USAWashington State Univ, Ctr Environm Res Educ & Outreach, Pullman, WA 99164 USANature Conservancy, Off Chief Scientist, Arlington, VA 22203 USA;
ecosystem services; History Database of the Global Environment; operations and maintenance;