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August 22, 2017; 114 (34)

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Cover image: Pictured is the city of Tokyo, Japan. Urban areas are home to more than half of the world's population and can provide widespread access to employment, education, and sanitation, but they also produce high levels of pollution and environmental degradation. Karen C. Seto et al. introduce the Sustainability in an Urbanizing Planet Special Feature, which explores the changes in human–environment interactions brought about by rapid urbanization and the challenges and opportunities for sustainability presented by urban areas. See the Introduction to the Special Feature by Seto et al. on pages 8935–8938. Image courtesy of Flickr/Marco Verch.

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