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Percent of Atmospheric CO2 from Human Activity

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  • mtneuman@juno.com
    The atmospheric concentration of CO2 has not been higher than 300 ppm in at least the last 425,000 years, prior to 1900.
    Message 1 of 1 , Aug 7, 2005
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      The atmospheric concentration of CO2 has not been higher than 300 ppm in
      at least the last 425,000 years, prior to 1900.
      http://www.grida.no/climate/vital/02.htm

      Since 1900, CO2 concentration levels in the atmosphere have risen from
      295 ppm to 379 ppm, or roughly 22%. Most of that increase is likely due
      to human's burning fossil fuels, with the remainder (<10%) due to
      deforestation (which increases the CO2 levels because of reduced
      photosynthesis). There are no natural causes identified in the literature
      for these increases in CO2 (and other greenhouse gases such as methane
      and nitrous oxide). Therefore, they must be human-caused.

      According to NOAA, the global warming rate in the last 25 years has risen
      to 3.6 degrees F per century, which tends to confirm the predictions of
      temperature increases made by international panels of climate scientists
      (IPCC). The rate of CO2 increase is also accelerating steeply, and is
      likely to continue to do so, even if significant reduction in CO2
      emissions begin now, since their is a lag effect in their buildup in the
      atmosphere.

      Mike Neuman
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