The book is primarily intended for the intelligent students and teachers of B. A., B. Com., B. Sec., BBA, BCA, M. A., M. Com., M. Sec., MBA, and MCA classes. . The book has following important features: • The language of book has been kept simple and the entire discussion has been built on a logical and coherent outlines. • The latest changes in our environmental policy have also been incorporated at the proper places. • The book covers comprehensively all important aspects of environment. • The text matter has been accompanied with adequate illustrative material which mates the study of subject interesting and readily understandable • Through out to tailor its approach, subject-matter and presentation of book is according to the requirements of modern time. • This book will be a source of knowledge and expertise readily available to the readers.