why do you say "you cannot just compare the slope" of the two lines?
Because we don't qualify for the bottom 2 scenarios. The top A1F1 line is the non-mitigation scenario where CO2 is allowed to increase. Our CO2 emissions have exceeded those incorporated into that scenario, thus we don't qualify for the bottom IS92a line on the graph. To suggest that we can compare the slope of the pink (reality) line to that of the lowest scenario line is to suggest that the assumptions for the higher sloped lines were incorrect. The most significant assumption was that temperatures would increase if CO2 levels increased.
Falsify "3. To declare or prove to be false."
There is no need to spread fear, uncertainty and doubt. There was no fudging of the starting time. The ensemble of models used by the IPCC have been shown to be inaccurate in their predictions that started in 2001. None of the scenarios they presented have accurately represented the real world. This is the point of the original post above.
