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Toxic lead buried in icy layers of an Andes glacier reveals that leaded gasoline was the region's worst polluter in the past 2,000 years, a new study reports.
Traces of lead pollution from precolonial mines and metallurgy (such as the extraction of silver and other metals) are present in the glacier going back hundreds of years. For instance, the research team found spikes in lead pollution during the height of the Tiwanaku-Wari culture (450 to 950) and the Inca Empire (450 to 1532). Pollution levels also rose when invaders expanded the local silver and copper mines during colonial times (1532 to 1900), and when there was a tin boom in the early 1900s, according to the report, published March 6 in the journal Science Advances. Read more...
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