Environmental engineering is the application of science and engineering principles to protect and utilise natural resources and improve environmental quality to enable healthy ecosystems and comfortable habitation of humans. The aim of this introductory book is to provide a concise and comprehensive coverage on environmental engineering. The book content covers the fundamental concepts/theories and their applications in environmental engineering. The key topics include environment, ecosystems, remote sensing of environment, environmental risk, water supply, water pollution control, solid waste, air pollution, noise pollution, climate change - impacts, mitigation and adaptation.