Modern cities can be designed to constitute a more supportive environment for a great many activities, provide a more livable habitat, and reduce the burden imposed on the biosphere. They can be made healthier (in terms of the definition by World Health Organization) and more sustainable by means of new and emerging preventive approaches. Healthy Cities focuses on those preventive approaches that can make cities healthier and more sustainable. This book, as well as the two companion volumes, Sustainable Energy and Sustainable Production, is the result of a twelve-year research project carried out at the Center for Technology and Social Development at the University of Toronto. The research findings led to the development of a new conceptual framework and strategy aimed at converting technological and economic growth into development that would gradually become more sustainable.