| CO2 Concentrations Last 800,000 Years |
| The atmospheric concentration of CO2 is continuing to increase at about 3.2ppm/year, having surpassed 400ppm for several months in 2014. |
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| Source: Scripts |
| URL: http://keelingcurve.ucsd.edu/ |
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| CO2 Concentrations Since 1700 |
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| Source: Scripts |
| URL: http://keelingcurve.ucsd.edu/ |