This book assesses the current available information concerning the major scientific problems related to environmental consequences of a possible nuclear war. The contributors address a broad range of topics, among them the effects of blast, heat, and local radioactive fallout; the likely dispersal patterns and residence times of radioactive debris in the troposphere and stratosphere; the probable long-term effects on both the local and global biosphere and radiological consequences for humans; the effect on the global environment of widespread fires in urban and industrialized regions; and the likely significant decrease of stratospheric ozone with a resulting long-term increase in harmful UV radiation received at the ground. The authors point to problem areas where current information is inadequate or completely lacking and discuss the role of the scientist in developing such information as a contribution to the elimination of the nuclear war threat.