Tola Gemechu Ango (IMAGE) Stockholm University Caption Tola Gemechu Ango, lead author of the study and researcher at the Deparment of Human Geography at Stockholm University. Credit Stockholm University Usage Restrictions May be used in connection to the related research License Original content 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.