Ĭarbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy. Graph by NOAA based on data from Lüthi, et al., 2008, via NOAA NCEI Paleoclimatology Program. On the geologic time scale, the increase (orange dashed line) looks virtually instantaneous.
During these cycles, CO 2 was never higher than 300 ppm. The peaks and valleys track ice ages (low CO 2) and warmer interglacials (higher CO 2).
Global atmospheric carbon dioxide concentrations (CO 2) in parts per million (ppm) for the past 800,000 years.
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