In brief
Researchers found that lead pollution from silver mining during the Roman Empire likely had deleterious effects on public health and intelligence, raising questions about the empire's capabilities.
The Roman Empire, flourishing about 2,000 years ago, was known for its advancements and rich culture. However, a new study reveals a dark side to its prosperity—widespread lead pollution resulting from extensive silver mining operations. Published in the journal Proceedings of the National Academy of Sciences, researchers indicate that the industrial activities of the Romans may have led to decreased intelligence levels in the population due to significant exposure to lead, the world’s first documented example of large-scale industrial pollution.The empire’s economy relied heavily on silver coinage, which necessitated large-scale mining that inadvertently released lead into the environment. “For every ounce of silver mined, approximately 10,000 ounces of lead were produced,” explains Joseph McConnell, an environmental scientist and lead author of the study. This excessive lead released into the air could have far-reaching health implications, especially when considering there is no safe threshold for lead exposure, as noted by neurotoxicologist Deborah Cory-Slechta.Moreover, McConnell and his team discovered lead residues in ice core samples from Greenland and Russia that date back to the time of the Roman Empire. Their findings suggest that airborne lead stemming from Roman mining activities was transported by air currents before settling in polar regions as snow. This historic pollution raises critical reflections on how industrial activities, even in ancient times, may have shaped societal capabilities and public health.
