Precautionary Tools for Reshaping Environmental Policy. Nancy J. Myers and Carolyn Raffensperger, eds. 2006. The MIT Press, Cambridge, MA. 400 pp. $62 cloth, $25 paperback.

It is telling that this otherwise useful and informative overview of the principles and application of the precautionary principle would include a chapter entitled “Answering the Critics.” The problem is that the authors have overlooked the answering of questions raised by their allies and supporters.