Conservation of the environment and coping with different problems faced by nations both developed and developing is a worldwide issue. This encyclopaedia presents a comprehensive list of terms used in Environment Science and different topics related with the Environment. As the structure of this glossary consists of many different types of users from end users to developers and translators, the present work is recommended as both a source and ready reference for students, teachers as well as environmentalists. The encyclopaedia includes either words that may be those used uniquely in the field or more common words that have a special meaning in the context of Environment Science, phrases, acronyms and other abbreviations and several type of entries not usually found in reference works pertaining to Environment Science. Some of the entries pertain to government and private research institutions and programs related to the Environment Science fields.