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Since I've written several times about the status of my pet project, I finally created a Wiki page about it: Towards a climate model.
In its final state it could be a how-to for implementing climate models, a step-by-step introduction. (1. Step: Learn how to program, 2. Step: program a numerical solution to..., 17.Step: predict the climate of a region of your choice for the next 80 years.)