Produced by Gregory Walker For an HTML version of this document and additional public domain documents on nuclear history, visit Trinity Atomic Web Site: http://www.envirolink.org/issues/nuketesting/ WORLDWIDE EFFECTS OF NUCLEAR WAR - - - SOME PERSPECTIVES U.S. Arms Control and Disarmament Agency, 1975. CONTENTS Foreword Introduction The Mechanics of Nuclear Explosions Radioactive Fallout A. Local Fallout B. Worldwide Effects of Fallout Alterations of the Global Environment A. High Altitude Dust B. Ozone Some Conclusions Note 1: Nuclear Weapons Yield Note 2: Nuclear Weapons Design Note 3: Radioactivity Note 4: Nuclear Half-Life Note 5: Oxygen, Ozone and Ultraviolet Radiation FOREWORD Much research has been devoted to the effects of nuclear weapons. But studies have been concerned for the most part with those immediate consequences which would be suffered by a country that was the direct target of nuclear attack. Relatively few studies have examined the worldwide, long term effects. Realistic and responsible arms control policy calls for our knowing more about these wider effects and for making this knowledge available to the public. To learn more about them, the Arms Control and Disarmament Agency (ACDA) has initiated a number of projects, including a National Academy of Sciences study, requested in April 1974. The Academy's study, Long-Term Worldwide Effects of Multiple Nuclear Weapons Detonations, a highly technical document of more than 200 pages, is now available. The present brief publication seeks to include its essential findings, along with the results of related studies of this Agency, and to provide as well the basic background facts necessary for informed perspectives on the issue. New discoveries have been made, yet much uncertainty inevitably persists. Our knowledge of nuclear warfare rests largely on theory and hypothesis, fortunately untested by the usual processes of trial and error; the paramount goal of statesmanship is that we should never learn from the experience of nuclear war. The uncertainties that remain are of such magnitude that of themselves they must serve as a further deterrent to the use of nuclear weapons. At the same time, knowledge, even fragmentary knowledge, of the broader effects of nuclear weapons underlines the extreme difficulty that strategic planners of any nation would face in attempting to predict the results of a nuclear war. Uncertainty is one of the major conclusions in our studies, as the haphazard and unpredicted derivation of many of our discoveries emphasizes. Moreover, it now appears that a massive attack with many large-scale nuclear detonations could cause such widespread and long-lasting environmental damage that the aggressor country might suffer serious physiological, economic, and environmental effects even without a nuclear response by the country attacked.