Over the past three decades, there has been an explosion of books on environmental problems. This book is different in the sense that it approaches the various environmental issues with an enigma in mind. The main objective of the book is to improve our knowledge of, and concern for, our environment. This text is ideal for students, but will also be of interest to researchers and consultants in the environmental sciences. A large number of examples and case studies are included. Multiple-choice questions at the end of each chapter will help students to prepare for examinations. A detailed glossary is also provided.