标题：Section 3: Contested Landscapes--The Ecological Structure of City Regions - From the Sanitary City of the Twentieth Century to the Sustainable City of the Twenty-First
出版社：eScholarship repository, University of California
摘要：A major challenge for the United States as it continues
to urbanize is how to make cities more livable while reducing
their environmental impacts: how to urbanize more
sustainably. Urban areas have substantial environmental
impacts on air and water quality and on habitat; they
consume high rates of energy and materials, especially in
developed countries; and they contribute significant fossilfuel
emissions.2
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