Webpage: “Frequently Asked Global Change Questions.” U.S Department of Energy, Carbon Dioxide Information Analysis Center. Last modified June 30, 2015. cdiac.ess-dive.lbl.gov What percentage of the CO2 in the atmosphere has been produced by human beings through the burning of fossil fuels? Anthropogenic CO2 comes from fossil fuel combustion, changes in land use (e.g., forest clearing), and cement manufacture. Houghton and Hackler have estimated land-use changes from 1850–2000, so it is convenient to use 1850 as.
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