The book 'Environmental Studies' has been prepared following the revised syllabus for undergraduate students prescribed by the University Grant Commission (UGC). Keeping in view, the importance of environmental issues in today's world, this book has been designed in such a way that not only the undergraduate students, but students of postgraduate level and professionals will benefit from it. The content of this book aims to train readers to cater to the needs of ecological citizenship through development of a strong foundation on the critical linkages between ecology-society-economy.