Ecotoxicology is a fast-expanding scientific field. This book outlines the historical background and the scope of this discipline and considers its current practices and developments. It proposes relevant and thought-provoking analyses of the methods currently used in an attempt to respond to difficult questions such as: Is it possible to predict ecotoxicological phenomena at different levels of biological organization? In an ecological context, how do predictions concerning the fate of the pollutants relate to their actual effects? This book is intended for specialists involved in pollution: scientists, engineers and governmental agencies, as well as those interested in this topical matter.