The first epic poem was written in Sumerian, which died out during a 200-year dry spell.
A 200-year-long drought 4,200 years ago may have killed off the ancient Sumerian language, one geologist says.
Because no written accounts explicitly mention drought as the reason for the Sumerian demise, the conclusions rely on indirect clues.
But several pieces of archaeological and geological evidence tie the gradual decline of the Sumerian civilization to a drought.
Via David Connolly