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A variety of air pollutants are emitted into the atmosphere from human-caused and natural emissions sources throughout the United States and elsewhere. These contaminants impact sensitive natural resources in wilderness, including the national parks. The system of national parks in the United States is among our greatest assets. This book provides a compilation and synthesis of current scientific understanding regarding the causes and effects of these pollutants within national park lands. It describes pollutant emissions, deposition, and exposures; it identifies the critical (tipping point) loads of pollutant deposition at which adverse impacts are manifested.
15.4.3 Modeling Studies
This book is an outcome of the Visual Values Workshop in 1982. It presents the ongoing research on state-of-the-art techniques and applications to address the human perception of changes in visual aesthetic resources and to assign psychological, social, and economic measures of value to visitors.
Now in a fully updated edition, this invaluable reference work is a fundamental resource for scholars, students, conservationists, and citizens interested in America's national park system. The extensive collection of documents illustrates the system's creation, development, and management. The documents include laws that established and shaped the system; policy statements on park management; Park Service self-evaluations; and outside studies by a range of scientists, conservation organizations, private groups, and businesses. A new appendix includes summaries of pivotal court cases that have further interpreted the Park Service mission.
Distributed to some depository libraries in microfiche.
A study of threats to national parks (noise and water pollution, smog, industrial spills and acid rain) from a political perspective. The focus is on two cases: the proposed mining of the tar sands of south- central Utah, near Canyonlands National Park, and poor air quality in several western parks caused by pollution. Annotation copyrighted by Book News, Inc., Portland, OR