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Extremely important to note the caution by the @metoffice scientist who actually led the development of this model:

“my first response is: why has the model done that? We are still in the stage of evaluating the processes driving the different response.”

theguardian.com/environment/20…
I see that this scientist (Cath Senior, our Head of Understanding Climate Change) is not quoted until paragraph 16 of the article, whereas Johan Rockström (not a climate modeller, and not involved in developing, evaluating or using this model in any way) is quoted in paragraph 5
Here's the paper the Guardian article is based on.

"It is, of course, still possible that the climate sensitivity of GA7 is in error due to other existing processes in the model being inadequately represented, and thus resulting in incorrect feedbacks."

agupubs.onlinelibrary.wiley.com/doi/full/10.10…
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