The Rocky Mountain West is largely arid and steep, with ecological scars from past human use visible for hundreds of years. Just how damaging were the past 150 years of activity? How do current rates of disturbance compare with past mining, grazing, and water diversion activities? In the face of constant change, what constitutes a "natural" ecosystem? And can a high quality of life be achieved for both human and natural communities in this region.

Rocky Mountain Futures presents a comprehensive and wide-ranging examination of the ecological consequences of past, current, and future human activities in the Rocky Mountain region of the United States and Canada. The book brings together 32 leading ecologists, geographers, and other scientists and researchers to present an objective assessment of the cumulative effects of human activity on the region's ecological health and to consider changes wrought by past human use. This combined view of past and present reveals where Rocky Mountain ecosystems are heading, and the authors project what the future holds based upon current economic and social trends and the patterns that emerge from them. The book:

• examines the biogeographic and paleoenvironmental setting and historical climate that have shaped Rocky Mountain ecosystems
• traces the direct human influences on landscapes and ecosystems over the past 150 years
• explores the cumulative effects of past, present, and projected future human activities on tundra, subalpine and montane forests, valleys, grasslands, and waters
• offers case studies that illustrate specific examples of human influence and current efforts to restore the environment

The United Nations has proclaimed 2002 as the International Year of Mountains to increase international awareness of the global importance of mountain ecosystems. The case-based multidisciplinary approach of this book constitutes an important new model for understanding the implications of land-use practices and economic activity on mountains, and will serve a vital role in improving decisionmaking both in the Rocky Mountains and in other parts of the world that face similar challenges.

Jill S. Baron is ecosystem ecologist with the U.S. Geological Survey, Natural Resource Ecology Laboratory at Colorado State University in Fort Collins.

Paul R. Ehrlich is Bing Professor of Population Studies and Professor of Biological Sciences at Stanford University. The author of Human Natures, The Population Bomb, and many other books, as well as hundreds of papers, he is a member of the National Academy of Sciences and a recipient of numerous international honors, including the Crafoord Prize, an explicit substitute for the Nobel Prize in fields of science where the latter is not given.