According to Elizabeth K. Fitch, the author of “Rapid Climate Change and the Collapse of the Maya Civilization”, she consolidated recent studies of exploration of sediment records from lakes in ancient Maya cities (Yucatan). Recorded data reveled that during Classic period of A.D. 250-830, the climate was obviously standing on their side, in which the land are wet and fundamental for agriculture. However, during the late 8th century and early 9th century, when the civilization collapse, evidence for a coincidence occurrence of an extended series of droughts was shown through testing cores. The rapid change of climate, therefore, may have worsened the overpopulated situation in ancient Maya as the droughts accelerated the increase in temperature
