Cooling Between 500 And 700 CE And Societal Change During The Late Antique Little Ice Age (image) Future Earth Share Print E-Mail Caption Summer temperatures were reconstructed from tree rings in the Russian Altai (red) and the European Alps (blue). Horizontal bars, shadings and stars refer to major plague outbreaks, rising and falling empires, large-scale human migrations, and political turmoil. Credit Past Global Changes International Project Office Usage Restrictions Use credit above. 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.