SOCIETY × ENVIRONMENT

An Empire Read in the Ice

~100 CE

History · Antiquity · Holocene · Meghalayan

Snow that fell on Greenland two thousand years ago carries lead smelted in Spanish mines. Read year by year, the ice records Carthaginian and Roman mining as hemispheric air pollution, rising with imperial expansion, peaking under the early Empire, collapsing with the plagues of the second and third centuries; the isotopes point to the mines of Rio Tinto.

Why it matters

Rome kept no economic statistics, so its GDP is argued from shipwrecks and potsherds; the ice offers something no text can, an annual, continuous, unfalsified gauge of ancient industry. It also moves the Anthropocene question backward: an empire polluted the atmosphere of half the planet two millennia before coal. History and geochemistry audit each other here.

Dating & uncertainty

The Greenland record is dated layer by layer to the year, from 1100 BCE to 800 CE; the fiche is anchored in the early Roman Empire, when emissions peaked. What the lead curve measures, mining output, coinage, the economy at large, is inference, argued through transport modelling and comparison with silver coin bullion.

Sources

1. McConnell et al. (2018), PNAS · Lead pollution recorded in Greenland ice indicates European emissions tracked plagues, wars, and imperial expansion during antiquitydoi:10.1073/pnas.1721818115
2. Hong et al. (1994), Science · Greenland ice evidence of hemispheric lead pollution two millennia ago by Greek and Roman civilizationsdoi:10.1126/science.265.5180.1841
3. Rosman et al. (1997), Environmental Science & Technology · Lead from Carthaginian and Roman Spanish mines isotopically identified in Greenland ice dated from 600 B.C. to 300 A.D.doi:10.1021/es970038k

Our species’ history as one day

23:51:118 min 48 s before midnight

if the 315,000 years of Homo sapiens were compressed into a single day