Heejun Chang is a professor of geography at Portland State University. His teaching and research focus on water sustainability in a changing environment using geospatial analysis. Chang has served as the lead author of the freshwater section of the first Oregon Climate Change Assessment Report and a representative for the Willamette River Basin in UNESCO’s Hydrology, Environment, Land, and Policy program.

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Policymakers and resource managers often frame ecosystem services management challenges as a matter of protecting natural areas outside of cities. Assuring good stewardship of nature’s services in rural areas is indeed crucial but is only part of the solution. Over 50 percent of the world’s human population now resides in urban areas, a figure …

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