as measured in the ice cores, co2 concentrations from the last 400,000 years - that's the last five glacial cycles - have never been as high as they are now. they rarely pushed 350ppm, right now we're pushing 400
graph
http://en.wikipedia.org/wiki/File:Vostok_Petit_data.svg
great article & more graphs: http://www.daviesand.com/Choices/Pre...ning/New_Data/
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11-07-2012Last edited by blumpkin blownuts; 11-07-2012 at 01:11 AM.
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