Humans began contributing to environmental lead pollution as early as 8,000 years ago, according to a new study published in the journal Environmental Science & Technology (paper in .pdf). Pittsburgh team analyzed the concentration of lead, titanium, magnesium, iron, and organic matter in sediment cores recovered from three lakes: Lake Manganese, Copper Falls Lake and Lake Medora (David P. Pompeani et al) University of Pittsburgh researchers have...
