
File name: SOTC_2021_paleo-CO2_1200x630px.jpg
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Global atmospheric carbon dioxide (purple line) is higher today than at any point over the past 800,000 years. The highest previous level was 300 parts per million (ppm). The increase since the end of the last ice age has been so fast that on this time scale, it looks practically instantaneous. NOAA Climate.gov image, based on paleoclimate data from Luthi et al., archived at NCEI.