The relentless growth of cities is inevitable--and irreversible. Developing countries' share of the world's urban population will rise to 71% by the year 2000 and 80% by 2025. By the end of the 1990s, it is estimated that 18 cities in developing countries will have a population of 10 million or more. Although those cities are centers of production, employment, and innovation, rapid urbanization has had many negative consequences: an alarming increase...