The IPCC uses a figure 1.2°C for the direct response to a doubling of CO2,(adsbygoogle = window.adsbygoogle || []).push({});

from 280 ppm to 560 ppm.

http://www.grida.no/climate/ipcc_tar/wg1/pdf/tar-01.pdf

I came up with an equation of 4(log 560)-4(log 280)= 1.2041199.

Is this the best way to fit this curve?

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# Doubling CO2 log curves

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