In brief
A new study published in Proceedings of the National Academy of Sciences indicates that widespread lead pollution from silver mining during the Roman Empire might have negatively affected health and intelligence, representing a significant case of industrial pollution long before modern times.
Roughly 2,000 years ago, the Roman Empire thrived, but hidden beneath its era of stability and prosperity was a grave environmental issue. Researchers reported on Monday in the journal Proceedings of the National Academy of Sciences that airborne lead pollution, a direct outcome of extensive silver mining, had deleterious effects on health and cognitive function across the empire.During the Pax Romana, beginning in 27 B.C., the Roman economy flourished, relying heavily on silver coinage. However, the extraction process for silver generated an overwhelming amount of lead waste. “For every ounce of silver mined, approximately 10,000 ounces of lead were released into the environment,” stated Joseph McConnell, an environmental scientist from the Desert Research Institute and the study’s lead author.Lead exposure is notorious for its harmful effects on the human body, with researchers asserting that any level of exposure can be detrimental. “There is no safe threshold for lead,” emphasized Deborah Cory-Slechta, a neurotoxicologist at the University of Rochester Medical Center who was not involved in the study.In a significant discovery, Dr. McConnell and his team observed lead particles in ice layers collected from regions in Russia and Greenland, dating back to the Roman period. They deduced that lead emissions from Roman mining activities were carried by wind currents, settling in Arctic areas as precipitation.As new findings emerge, they provide a sobering perspective on the cost of Rome’s economic expansion, suggesting that the toxic legacy of industrial activities was not solely a modern phenomenon but rooted deep in history's narrative, influencing the health of populations thousands of years ago.
