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File: maunaloa_weekly-CO2-graph-with-photo-2014_610.jpg

Graph of weekly average atmospheric CO2 from 2010 to 2014 superimposed over a photo of the Mauna Loa Observatory, HI where the samples were collected

Image caption

Weekly average concentration of carbon dioxide at Mauna Loa between 2010 and early 2014. Graph by NOAA Climate.gov, based on data provided by NOAA ESRL.  Mauna Loa photo by Mary Miller, Exploratorium.