Gerard Piel brings to the monumental issues addressed in Only One World the knowledge and understanding accumulated in his four decades as publisher of Scientific America?. Under his leadership, the magazine has distinguished itself not only by bringing the achievements of science to the wider audience, but also by monitoring the industrial revolution, the effects of human activity on the environment, the arms race and arms control, population growth, and economic development. In nine languages and 10 editions, Scientific American has a worldwide circulation of more than one million readers.