I guess I'm not understanding the problem... The German blog is comparing charts of two different types of models... emissions vs concentration... why is so shocking that one type of model comes out with a 0.9*C difference after ~85 years vs another type of model?
I'm also not clear what you're trying to get at... that policy should be set based on the lowest error bar of the lowest emission or lowest concentration model? That doesn't make any more sense than setting policy on the highest error bar of the highest model (~6.5*C).
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