As projects like Manhattan's High Line, Chicago's 606, China's eco-cities, and Ethiopia's tree-planting efforts show, cities around the world are devoting serious resources to urban greening. Formerly neglected urban spaces and new high-end developments draw huge crowds thanks to the considerable efforts of city governments. But why are greening projects so widely taken up, and what good do they do? In How Green Became Good, Hillary Angelo uncovers the origins and meanings of the enduring appeal of urban green space, showing that city planners have long thought that creating green spaces would lead to social improvement. Turning to Germany's Ruhr Valley (a region that, despite its ample open space, was "greened" with the addition of official parks and gardens), Angelo shows that greening is as much a social process as a physical one. She examines three moments in the Ruhr Valley's urban history that inspired the creation of new green spaces: industrialization in the late nineteenth century, postwar democratic ideals of the 1960s, and industrial decline and economic renewal in the early 1990s. Across these distinct historical moments, Angelo shows that the impulse to bring nature into urban life has persistently arisen as a response to a host of social changes, and reveals an enduring conviction that green space will transform us into ideal inhabitants of ideal cities. Ultimately, however, she finds that the creation of urban green space is more about how we imagine social life than about the good it imparts.

"How Green Became Good is an exceptionally robust work of historical sociology, shown by the fact that Angelo not only provides the reader with the historical specifics of each greening project analyzed in the book, but also uses those details to skillfully build a general theoretical explanation for how urban greening works as a social process. . . .  Angelo’s work serves as a model for other scholars inclined to take a historical approach to answering question sin urban sociology and urban studies." - Urban Studies

"How Green Became Good is a powerful work of urban sociology, culture, and historical and comparative methods. In it, Hillary Angelo challenges conventional accounts of why urban greening became a public good." - Social Forces

"Interested in how planning projects, specifically those sold as 'green,' can exacerbate or ignore existing inequalities. . . Angelo’s more specific question is why have all types of cities taken up 'greening' projects
rather than just large, industrial cities? . . . Taken on their own terms, these projects have been remarkable successes, ecologically and economically, but Angelo’s point is clear: the 'greening' at the core of their
conceptions has blunted social criticism. . ." - Journal of Urban Affairs

"These interventions deserve wide reading by all sociologists, not just urban sociologists or environmental sociologists." - American Journal of Sociology