Book excerpt: Relying on a wealth of data, Goklany shows how innovation, increases in affluence, and key institutions have combined to address environmental degradation that sometimes results from growth. The evidence on the use of cropland, trends in air pollution, and diverse experiences in water usage counters the gloomy outlook of some environmentalists. Goklany explains why the state of the world is improving and offers a realistic assessment of the sustainability of the human enterprise, setting priorities for dealing with such challenges as climate change.