Why Nations Fail: FROM THE WINNERS OF THE NOBEL PRIZE IN ECONOMICS: The Origins of Power, Prosperity and Poverty

by Daron Acemoğlu

Another fascinating way to find evidence of economic growth is from the Greenland Ice Core Project. As snowflakes fall, they pick up small quantities of pollution in the atmosphere, particularly the metals lead, silver, and copper. The snow freezes and piles up on top of the snow that fell in previous years. This process has been going on for millennia, and provides an unrivaled opportunity for scientists to understand the extent of atmospheric pollution thousands of years ago. In 1990–1992 the Greenland Ice Core Project drilled down through 3,030 meters of ice covering about 250,000 years of human history. One of the major findings of this project, and others preceding it, was that there was a distinct increase in atmospheric pollutants starting around 500 BC. Atmospheric quantities of lead, silver, and copper then increased steadily, reaching a peak in the first century AD. Remarkably, this atmospheric quantity of lead is reached again only in the thirteenth century. These findings show how intense, compared with what came before and after, Roman mining was. This upsurge in mining clearly indicates economic expansion.