Environmental Studies is a vast and rapidly growing subject with increasing relevance for sustainable development. It is the systematic study of the environment, with our proper place and role in it. Realizing the importance of environmental education, the Supreme Court ordered that a basic course on the environment be introduced as a compulsory subject on all levels of education. Textbook of Environmental Studies deals with the various facets and dimensions of the environment in an integrated, multidisciplinary, and holistic manner. It provides an up-to-date, introductory view of essential topics in environmental studies to help students understand and retain the general principles. It is written with the understanding that even students without prior background in science should be able to use it, and so it has not been laid heavy with technical jargon. At the same time, it has enough depth to make it suitable as a textbook for students of different courses including humanities, commerce, sciences, and engineering.