This series showcases extraordinary stories of environmental rebirth in four different American cities. Each program examines the unique environmental, economic and social issues that face one of the country's great cities and the innovative solutions that have helped to turn its problems around.  Interviews with citizen activists, politicians, urban planners, and just plain folks who have labored long and hard to contribute to their city's urban renaissance reveal how passion combined with innovative strategies can address the widespread problems facing many of America's urban environments today.