File name: paleo_keelinginset_v2_610.gif
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Atmospheric carbon dioxide concentrations in parts per million for the past 800,000 years, with the 2013 annual average concentration as a dashed line. The peaks and valleys in carbon dioxide levels follow the coming and going of ice ages (low CO2) and warmer interglacials (higher CO2). Graph by NOAA Climate.gov, based on EPICA Dome C data (Lüthi, D., et al., 2008) provided by NOAA NCDC Paleoclimatology Program.