The Roman Warm Period was a climate anomaly where the average temperature was two to three degrees warmer than it is today. So what did this look like, how did it affect Roman civilization, and what are our sources for it? SOURCES: The Fate of Rome, Kyle Harper Lead Pollution recorded in Greenland ice indicates European emissions tracked plagues, wars, and imperial expansion during antiquity, Joseph McConnell et al Rise and fall of Roman Empire exposed in Greenland ice samples, Katie Langin Bunker Cave stalagmites: an archive for Central European Holocene climate variability, J. Fohlmeister et al New Cities in Late Antiquity: Documents and Archaeology, Efthymios Rizos