As a branch of engineering, environmental engineering refers to the science of applying different engineering and scientific principles in order to protect humans from the harmful effects of environmental factors. The field also encapsulates the improvement of environment quality and protection of the environment. The issues of human and animal waste control, asset protection and energy preservation are vital to this field. Some of the areas of focus in environmental engineering are pollution, global change, solid waste management, risk assessment, resource recovery, etc. Sustainable design is one of the solutions to global environmental crisis. It deals with the theory and practice of designing objects, environment and services in compliance with the principles of economic, ecological and social sustainability. It may involve innovative practices in the areas of architecture, landscape and garden design, agriculture and manufacturing, besides others. This book studies, analyzes and upholds the pillars of environmental sustainability and its utmost significance in modern times. The objective of this book is to give a general view of the different areas of environmental engineering and their applications. It will serve as a reference to a broad spectrum of readers.