Now, the three known participants of the effort spelling out the assumptions in Arnell's study have published their results as comments further down. For some reason, a number of readers could not resist the temptation to please the rest of the crowd with their opinions on other issues related to Arnell - either that any assertions that the paper would not be fine (which have not been made), are baseless, or that one should discuss more if Meichsner article about AfricaGate was right, or that I would have a biased attitude favouring skeptics - , but somehow we have now have ended the "listing" phases of merely listing the assumptions made, without judging their plausibility or legitimacy.
The three commentators, Reiner Grundmann, Günter Heß and myself, have not come to the same list - and I invite now everybody to comment whether our three listings are in order, and what you think about these assumptions. To make this easier, all comments apart of the three listing comments as well a few procedural explanations are deleted now. Please keep in mind that the purpose of this effort is to find out if we can agree on certain issues, independently of what we think about the severity of anthropogenic climate warming. Parallel to this, I am opening a new thread, where all kind of comments on this process, on Arnell, Meichsner, on my biases, on the unfairness of deleting comments, are welcome. But please stay disciplined with the present thread - it is only on talking about the assumptions employed by Arnell, not on other publications and also not on the conclusions drawn by Arnell.
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During a previous discussion on "Africagate" many comments were dealing with Arnell's analysis of possible future drought conditions or water stress in Africa. The participants of the discussion could not really agree how robust the analysis would be, and whether it was wise by the IPCC to base its perspectives mainly or even exclusively on this paper. (Correct presentation so far?)