Not So Clear-Cut: Soil erosion may not have led to Mayan downfall

Hand-planted maize, beans, and squash sustained the Mayans for millennia, until their culture collapsed about 1,100 years ago. Some researchers have suggested that the Mayans’ very success in turning forests into farmland led to soil erosion that made farming increasingly difficult and eventually caused their downfall. But a new study of ancient lake sediments has revealed that most erosion happened well before the culture collapsed and likely played only a small role in disrupting the civilization.