Fully revised and expanded to provide a concise but thorough introduction to environmental chemistry in its widest sense; retains an emphasis on describing how natural geochemical processes operate over a variety of scales in time and space, and how the effects of human perturbations can be measured;?topics range from familiar global issues such as atmospheric pollution and its effect on global warming and ozone destruction, to the microbiological processes that cause pollution of drinking water in deltas; contains sections and information boxes that explain the basic chemistry underpinning the subjects covered.