View from the Ancient City of Polonnaurwa into Sri Lankan Dry Zone Tropical Forest at Dusk (image) Max Planck Institute for the Science of Human History Share Print E-Mail Caption New methodologies have also shown that ancient populations created vast urban settlements in these habitats. Lessons can be learned from how these ancient urban centers dealt with environmental challenges, such as mud-slides, soil erosion, and drought, that are still faced by increasingly dense urban populations in these areas today. Credit Patrick Roberts Usage Restrictions The image may only be used in the context with this press release and with an appropriate caption and credit. 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.