Book excerpt: World's fairs were created to show off the wonders of the industrial revolution. But industrial progress has led to a polluted planet. This book provides an overview of world's fairs at the turn of the millenium. It describes the nature of fairs, shows how they evolved, & considers where they may be headed. The author demonstrates how fairs have tried to cope with the environmental consequences of the idea of progress they have traditionally celebrated. He suggests how fairs (& by implication the society as a whole) can do a better job of it in the future.