Peak of the Roman Civilization

Oct 2018
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Jun 2019
This is a cool graph. From the following paper: Lead pollution recorded in Greenland ice indicates European emissions tracked plagues, wars, and imperial expansion during antiquity

It shows non-background lead deposition in Greenland ice and estimated atmospheric lead emissions as an indicator for silver production across antiquity.

View attachment 21423
View attachment 21422
This graph gives indications of the rise in material output across the meditteranean, which peaked before 100 AD, in the reign of Trajan, then began an inexorable decline until, by 476 AD, output was back to the level of 700 years previously.
Do you guys know if this kind of studies exist for the Han Empire too, and if the Chinese data overlap with Roman data?