When Cities Emerged Worldwide (IMAGE) Yale School of the Environment Caption The figure shows the year of the first recorded population value for each city in the dataset. Cities recording the earliest first population data point are pictured in red and are centered near Mesopotamia, while cities with the most recent first population data point are pictured in dark blue. Credit Esri, HERE, DeLorme, MapmyIndia, ©OpenStreetMap contributors, and the GIS user community Usage Restrictions None License Licensed 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.