CO2 measurements from 1970-2015 at Mauna Loa, Barrow, Samoa, and South Pole

Monthly averages of atmospheric CO2 measured at Mauna Loa, Barrow Alaska, American Samoa, and the South Pole from 1970 to 2015.  The annual cycle differs between sites, but the ever-increasing trend is the same at all sites.

Source:  NOAA 

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