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註釋Urban Future 21 addresses the challenges of this urban explosion in the century to come. Produced by the World Commission on 21st-Century Urbanization as basic input to their report, presented at the conference URBAN 21 held in Berlin in July 2000, it demonstrate graphically where present trends will lead the world's cities - and presents a realistic blueprint for meeting the problems that will result. Chapter I sets the scene of world development at the start of the new millennium. Chapter II outlines the basic driving forces which will present new challenges and new constraints to the world's city dwellers - but also new opportunities to reshape their own lives. It highlights the likely outcomes if present trends continue without positive policy interventions to bend or shape them. Chapter III presents two alternative scenarios: one, Business as Usual, based on continuation of today's trends; the other, Bending the Trends, in which cities take decisive action to change for the better. Chapter IV sets out principles of a sustainable urban future: a vision, based on sustainable urban development and decentralized local empowerment, which should guide cities in developing solutions to the problems of the urban explosion of the twenty-first century. Finally, Chapter V applies these principles in an action plan for the world's cities, showing precisely what national and city governments will need to do in order to secure a sustainable future.