Environmental science is an interdisciplinary subject which encompasses biological, physical and information sciences such as, ecology, chemistry, zoology, oceanography, soil science and many others. It also includes atmospheric science. It uses all these scientific fields to study the environment and find solutions to environment related problems. Environmental science provides a quantitative and integrated approach to the study of environmental systems. Environmental science aims to understand the earth processes, mitigation of pollution, alternative energy systems and also the effects of global climate change. It examines the environmental problems and finds the appropriate solutions. The four primary components of this discipline include ecology, geoscience, atmospheric sciences and environmental chemistry. All these components can be further classified into focused branches to facilitate the understanding of our environment. This book traces the progress of this field and highlights some of its key concepts and applications. It strives to provide a fair idea about this discipline and to help develop a better understanding of the latest advances within this field. Those in search of information to further their knowledge will be greatly assisted by this book.