Book excerpt: "In Green Cities, Matthew Kahn surveys the burgeoning economic literature on the environmental consequences of urban growth. He discusses the environmental Kuznets curve, which theorizes that the relationship between environmental quality and per capita income follows a bell-shaped curve. The heart of the book unpacks and expands this notion by tracing the environmental effects of economic growth, population growth, and suburban sprawl. Kahn considers how cities can deal with the environmental challenges produced by growth. His concluding chapter addresses the role of cities in promoting climate change and asks how cities in turn are likely to be affected by this trend."--BOOK JACKET.