Understanding the psychological determinants of environmental behaviour may be the key to saving the earth for future generations, yet this issue has not received adequate attention in the past. This book brings together the research of leading psychologists to examine the subject of the psychological factors that influence environmental decisions. The essays focus on the psychology and economics of environmental valuation, barriers to environmentally-friendly behavior, mental models of the environment, and assessments of risk and the environment. The book consolidates existing knowledge and stimulates discussion of future research topics that are relevant to decision-making and the environment.