This book of Environmental Sciences comprehensively covers numerous aspects of the subject. It covers topics such as Multi-disciplinary nature of environmental sciences, Ecosystems, structure and functions of ecosystem, natural resources, biodiversity , disaster management, social issues and the environment, Population- structure and distribution, various chemical processes operating in the environment, greenhouse gases emissions, global warming, among others. The book will prove particularly beneficial to those involved in understanding the basics of environmental sciences, environmental management, understanding the environmental issues and concerns faced in 21st century and community health practices, to mention some. It covers the entire length and breadth of the environmental sciences syllabus for undergraduate provided by UGC, providing concise, non-technical explanations of physical processes and systems and the effects of human activities on environment. Example problems, diagrams, and photographs are used to illustrate and clarify important topics. There is more than ample material in the book for a typical one semester course.