The interdisciplinary nature of risk assessment coupled with our relatively incomplete understanding of ecosystems and their functioning makes the task of risk assessment extremely complex. This book presents a holistic view of the fundamental principles and practicable methods in the case of polluted soils. The author proposes a set of definitions before developing different aspects of the evolution of pollutants in the soil and their toxicity. It then leads readers through the process of risk formulation essential for establishing a procedure that includes economic, social, and political data. The book is an authoritative resource for decision makers, evaluators, and students of environmental science.