The environment is an invaluable resource, and understanding its chemistry is essential to the continued sustainability of life on earth. Environmental science, which builds on the foundation of chemistry, seeks to remedy the present deterioration and degradation caused by humans, and to create new technology that will prevent further damage. This book deals comprehensively with the five essential global cycles or environspheres -- lithosphere (minerals and energy sources), atmosphere (air), hydrosphere (water), pedosphere (soil), and biosphere (life) -- and provides a clear overview of the crucial interaction away them. It covers the chemistry of energy resources and aspects of biochemistry, geochemistry, and toxicological chemistry, in addition to the three important areas of air, water, and soil; in the process, it links chemical principles with environmental issues. With the fundamental principles presented clearly and the topics covered in a logical sequence, this book can be used as a textbook of environmental chemistry for the environmental engineering or environmental science major.