'Until recently, George Shackle's work has not been appreciated adequately by mainstream economists. Young's book is the first attempt to use the Shackle model to handle the hard uncertainty issue in environmental decisionmaking. Such an approach could be fruitfully applied to other case studies involving environmental decisions as well as other nonenvironmental decisions conditioned by hard uncertainty. This book has succeeded admirably in demonstrating how to apply an abstract theory in tackling problems in a real-world situation. This volume represents a major contribution to environmental economics. Besides presenting a thoughtful critique of the conventional expected-utility approach, Young's book has made a convincing case that the presence of hard uncertainty radically alters the way in which environmental uncertainty can be dealt with at both an epistemological and a practical level. The book is very well written and logically organized. It will be of great interest to both academic as well as policy audiences.'