An international group of scientists found that the plague in Europe, slowed economic growth and the development of human civilization. This is the conclusion they came to based on the results of the analysis, thirteen of the ice cores extracted from glaciers in the Russian Arctic and Greenland. About it reported in a press release on EurekAlert!.
The researchers assessed the content of lead in samples of ice were dated in the period of time from 500 to 2010 ad. It turned out that increasing the concentration of heavy metals is closely linked to the emergence of new technologies and rapid economic growth. Reduction of its quantity corresponded to climatic changes (little ice age), wars, epidemics and famine.
Thus, a steady growth of lead pollution in the early middle Ages (800-1300 ad.) speaks about the economic growth, when in such places as the German Harz mountains and the Erzgebirge, was discovered new deposits of ore. The metal content is decreased in the period of the late middle Ages and early modern times (about 1300-1680 years BC), when Europe was raging plague.
According to the researchers, the level of lead is currently about 60 times higher than in the early middle Ages. Heavy metal pollution in the Arctic over the past 1500 years has grown exponentially. However, after the adoption of a number of environmental measures, including U.S. Law on pure air 1970, the level of pollution in the Arctic ice has fallen by more than 80 percent.