Today there is worldwide concern that many of our human activities are endangering perhaps permanently the quality of the environment. We must act fast to address these growing problems. The second edition of Principles of Environmental Chemistry exposes readers to environmental issues from a perspective that appreciates that chemical reactions drive all natural processes and outlines the connection between those processes and human behavior. Written for students with knowledge of general chemistry, this text provides the tools needed to understand the underlying chemical processes operating in the environment, while demonstrating how challenging it is to measure these systems. With this concept of interdependence students will begin to understand pressing environmental issues like ozone depletion, global warming, air and water pollution, and the hazards of radioactivity.