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Real temperature goes from 1.1 C to 2 C when CO2 increases from 420 to 472 ppm I is (2-1.1)/(472-420) = 0.0173 C/ppm CO2 increase is 12.38 % t increase 0.9 C sys := {1.443*x*ln(420/275) - 1.443*x*ln(400*1.1238/275) = 0.9}; evalf(solve(sys, {x})); x= -9.182109498
The IPCC line based on cs=3 : 2C from 275 ppm to 450 ppm (2-0)/(450-275) = 0.0114 C/ ppm
1.443*cs*ln(420/275)=1.1 1.443*cs*ln(474/275)=2
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