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 Graphic Carbon dioxide hits new high Perhaps the most impressive of cloud formations, cumulonimbus (from the Latin for "pile" and "rain cloud") clouds form due to vigorous convection (rising and overturning) of warm, moist and unstable air Data are reported as a dry air mole fraction defined as the number of molecules of carbon dioxide divided by the number of all molecules in air, including CO 2 itself, after water vapor has been removed The mole fraction is expressed as parts per million (ppm) Example is expressed as 400 ppm The annual increase in atmospheric N 2 O in a given year is the increase in its abundance (mole fraction) from January 1 in that year to January 1 of the next year, after the seasonal cycle has been removed (as shown by the black lines in the figure above) Changes Since The Industrial Revolution American Chemical Society Increase of greenhouse gases graph