Synopsis Environmental Science is the science of the physical, chemical, and biological conditions of the environment and the effect of this on organisms. It is an interdisciplinary science that relies heavily on the natural sciences. It also relies on biology, ecology in particular. The social sciences and economics are also major contributors to the field in that humans and their natural environment are interconnected in multiple ways. This book provides an introductory survey of the field of environmental science. It introduces the characteristic features of world ecosystems discusses the major environmental challenges we face today. This publication will be useful to the readers to acquaint then with the recent research trends in the area of ecology and Environmental Science.