This book seeks to impart comprehensive understanding of the major ecological issues, policies and environmental problems. The text is designed to meet the needs of students studying ecology and environmental science. It is a lucid presentation of the fundamental concepts and principles of ecology and environmental science. Extensively illustrated, the book provides an in-depth coverage of major area and introduces the reader with all the information which was otherwise scattered, in a single volume. It is believed that the text is not only suitable to the students and teachers of the subject but also serves as a reference book to all the professionals and researchers in the field.