'Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.' This definition was written 20 years ago in the Brundtland Report, commissioned by the United Nations. Since then, the goal of sustainable urban development has been embraced, in theory, by many officials and design professionals all over the world. But examples of meeting today's needs seem limited to the more prosperous segments of society. Living conditions today in the slums of many of the world's largest cities are appalling, and not improving. — Editor
