Environmental Science is one of the multidisciplinary branches of Biological sciences. As new courses of arts and sciences are introduced by various universities by each day passing, students' interest in our surroundings is decreasing. No-one is careful enough to know about surroundings means our environment. This ignorance leads to more pollution and degradation of our environment. That's why scientists think that a minimum basic education of environment and related issues must be given to all individuals' right from their junior classes to UG and PG level. This book is divided into 6 parts with 27 chapters. The authors present the book in simple concise language and a lucid manner. This book focuses on all the topics related to compulsory paper of environment studies at UG level for B.A., B.Sc., B.Com. (Pass and Honours Courses), B.Tech. as well as elective papers in PG level as M.A., M.Sc. and M.Com. Not only these courses but also this book is useful for various competitive exams such as NET, SLET, IFS, IES, and PG-CET of various state and central universities. This comprises of all the topics related to environmental science in a "nutshell".