Williams (education, U. of Birmingham, UK) proposes that the extreme complexity of the threats to human intelligence posed by a polluted environment calls for the use of a collective term: environmentally mediated intellectual decline, or EMID. He investigates the impact of EMID in terms of medical and social sciences, ecology, evolutionary theory, ethics, and legality. He questions the current faith in risk assessment, considers the possibility of regressive brain evolution, and suggests changes in education and human behavior that might help to remedy the situation. Distributed by Books International. Paper edition (33856-7), $24.95. Annotation c. by Book News, Inc., Portland, Or.