This book deals with the environmental issues in an integrated manner. Topics like Natural Resources, Ecosystems, Biodiversity and Pollution, relationships of Environmental Sciences with social issues and human populations have been discussed in detail as per the module syllabus formulated by UGC for Environmental Studies at the undergraduate level in all streams including various branches of Engineering as well as MBA. At the end of each chapter, a large number of questions of various types are given. The last chapter deals exclusively with fieldwork in which practical suggestions have been given for work in various situations. Answers to multiple choice questions are given in one of the five appendices.