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The
trend since 1850 has been "essentially zero"
31 Dec 09 - New research finds that the airborne fraction of carbon dioxide has not increased either during the past 150 years or during the most recent five decades, contrary to some recent studies. See entire article" http://www.sciencedaily.com/releases/2009/12/091230184221.htm Thanks to Jamie Shotts, Martin Hoer, John Mortimer, Stephanie Relfe and George Fitzsimmons for this link "When will common sense prevail?" asks John. "No CO2 increase in the last 150 years or even the last 50 years. God Bless you for all the good work you are doing."
See also
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