" In 1970 he was hailed on a Time magazine cover as the "Paul Revere of ecology." A year later he published The Closing Circle, an impassioned book that warned of the dangers of environmental pollution. In 1972 the Club of Rome, a loose association of scientists, technocrats, and politicians, produced The Limits to Growth. Employing computers to test economic models, the authors concluded that the world would self-destruct by the end of the century unless planners figured out ways to limit population and industrial growth and to expand supplies of food and energy. "