:There is ... a well-accepted data-set of [[global temperature]] and CO<sup>2</sup> concentrations for the past 400,000 years which shows it is temperature driving an increase in CO<sup>2</sup> and not CO<sup>2</sup> driving temperature. [http://www.heartland.org/full/24851/The_Politics_of_Global_Warming.html]
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:There is ... a well-accepted data-set of [[global temperature]] and CO<sub>2</sub> concentrations for the past 400,000 years which shows it is temperature driving an increase in CO<sub>2</sub> and not CO<sub>2</sub> driving temperature. [http://www.heartland.org/full/24851/The_Politics_of_Global_Warming.html]