Horsepower (image) The Earth Institute at Columbia University Share Print E-Mail Caption New research suggests that unusual weather aided the rise of the Mongol empire in the 1200s. Many modern Mongolians live as their ancestors did -- but climate change may finally drive them off their land. Credit Kevin Krajick/Earth Institute, Columbia University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.