The book describes in detail about water resources storage cycling ecosystem function of marine freshwater lakes rivers and other wetlands biological and physicochemical characterizations kinds and causes of pollution and control devices. It also describes in detail the atmospheric factor air pollution due to industrial domestic and other sources global changes ozone depletion and UV-B enhancement effects and about air pollution control technologies. Soil pollution problems of solid wastes soil erosion and conservation radioactive pollution noise pollution laws and international efforts on pollution controls are described in different chapters. Important topics of current interest like biological magnification eutrophication ecotoxicology bioremediation waste-water treatment rising levels of CO2 CFCs methane and other greenhouse gases are described in detail.