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Figure 9.1.3. Historical carbon dioxide (right axis and blue lines) and reconstructed temperature (as a difference from the mean temperature for the last 100 years in red) records based on Antarctic ice cores, providing data for the last 800,000 years. Atmospheric carbon dioxide levels, as measured in air, are higher today than at any time during the past 800,000 years.
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Future of Food:Student Materials.

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Credit: Used under under the <a href="" title="w:en:Creative Commons">Creative Commons</a> <a href="" rel="nofollow">Attribution-Share Alike 3.0 Unported</a> by <span style="text-align:center; background-color:#f9f9f9"><font color="#222222"><font face="sans-serif"><span style="font-size:14px">Leland McInnes at the English language Wikipedia.</span></font></font></span>
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