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Synopsis This book is designed to meet the needs of students who enroll for ecology and environmental science. A vast literature on this subject is available but this book is a single volume discussion covering all the aspects of ecology and environment. This book is a current and comprehensive, yet not encyclopedic, intended for an introductory audience. Much effort has taken to provide all possible information and the subject is discussed in multiple angles to cater the diverse interests of the reader. This book is divided into eleven chapters covering ecology, ecosystem, bio-diversity, spheres of earth, environmental pollution, wastes management, environmental laws, impact assessment, environmental agencies and environmental organization. Needless to say this book would be highly useful to the under graduate and post graduate students of science subject. University faculty dealing with ecology and environmental pollution would find this book as an invaluable reference book. In fact this book is not only meant for students and teachers but also for the people who are very much concerned with the well being of our environment. The pictorial representations in this book are not just concerned with the related subject but provide extra information associated with particular subject, in providing supplementary knowledge and hence increasing the knowledge by leaps and bounds. Though it is not possible to include the pictures for each and every terms associated with ecology and environment but effort has been made to include the pictures, which are more relevant to the subject and will help in understanding the subject. The photos were carefully selected to add realism to the subject and to increase the interest of the reader. Since student use of the text was one of our primary concerns, we made a concentrated effort to write a book that is highly usable to understand the basic and fundamental concepts of ecology and environment. To achieve this goal the book is written concisely and well illustrated. Important terms are printed in boldface type within the body of the text and a glossary is included at the end of the text for easy reference.