June 15, 2014

May 31, 2014

April 08, 2014

April 04, 2014

February 03, 2014

December 27, 2013

December 20, 2013

November 20, 2013

November 13, 2013

August 25, 2013

April 16, 2013

August 24, 2012

September 19, 2011

April 29, 2011

April 04, 2011

November 01, 2010

Current CO2 level in the atmosphere

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