This reference work now includes 250 articles - many of them new to this volume - in all major environmental subjects of broad interest: from rainforests to hazardous waste and sewage treatment. It offers a complete overview of current environmental problems and the solutions needed to ultimately protect and preserve our environment. Numerous photographs, diagrams, charts, graphs, and line drawings supplement the text. It is designed to serve as an essential source for environmental scientists and engineers, technologists, environmental planners, ecologists, landscape architects, civil engineers, government officials, students, concerned businesspersons, and any interested reader.