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" ... On the geochemical front, we have seen increases in chemical markers associated with pesticides, polyaromatic hydrocarbons, altered lead isotopic ratios from gasoline, increased nitrate levels from agriculture, ozone depleting chlorofluorocarbons, higher levels of CO2 and other greenhouse gases in the atmosphere, and unique isotopic signatures associated with nuclear and atomic weapons. Global thermonuclear weapons tests created a chemical release called the "bomb spike" where excess 14C, 239Pu, and artificial radionuclides were released globally from 1952 to 1980. ... "