Ancient Rome’s Collapse Is Written Into Arctic Ice - The Atlantic 

This finding reverses a widely cited study from the 1990s that reached almost exactly the opposite finding. That paper, which used a similar but rudimentary technique to pull lead emissions out of the Greenland ice, argued that Roman economic productivity peaked during the late Republic, then stagnated throughout the entire Roman Empire. But that study drew from 18 data points; this new research made 25,000 different measurements of the ice core.

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