Around the world, in fact, the years around 1300 produced an appalling trend toward religious and ethnic intolerance, a movement that must be explained in terms of global factors, rather than merely local. The aftereffects of the Mongol invasions certainly played their part, by terrifying Muslims and others with the prospect of a direct threat to their social and religious power. Climatic factors were also critical, as the world entered a period of rapid cooling, precipitating bad harvests and shrinking trade routes: a frightened and impoverished world looks for scapegoats.
