Thoroughly revised and updated to include the latest research in the field, provides over 9,000 alphabetically arranged entries on scientific and social aspects of the environment, including concise and authoritative information on key thinkers, treaties, movements, organizations, concepts, and theories. For the second edition, Allaby has added over 700 new entries, including "aerial plankton," "cyclone collector," "oasis," and "supertramp." The dictionary also features many useful appendices that provide sources of online data on the environment, international environment treaties, the Beaufort scale of wind strength, a geological time-scale, the chemical elements, and SI units. In addition, readers have access to recommended web links that are listed and regularly updated on a dedicated companion website. The book also includes line drawings to illustrate entries. Covering such key subjects as sustainable development, biodiversity, and environmental ethics, the dictionary provides state-of-the-art information for readers interested in environmental science, conservation studies, and related topics.