Revised and updated, this sixth edition of a bestseller spans the entire spectrum of environmental science and engineering. Still the most comprehensive, authoritative reference available in this field, the monumental two-volume encyclopedia now includes more than 90 articles on topics ranging from acid rain, air pollution, and community health, to environmental law, instrumentation, modeling, alternative energy, toxicology, radioactive waste, and water treatment. This reference provides the information necessary to understand, manage, and respond to threats to the human environment.