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This innovative study argues that the collapse of Classic Maya civilization was driven by catastrophic drought. Between A.D. 800 and 1000, unrelenting drought killed millions of Maya people with famine and thirst and initiated a cascade of internal collapses that destroyed their civilization. Linking global, regional, and local climate change, the author explores how atmospheric processes, volcanism, ocean currents, and other natural forces combined to create the dry climate that pried apart the highly complex civilization in the tropical Maya Lowlands in the ninth and tenth centuries....