Literature/Material/Software: All relevant information will be provided as course material during the lecture. The content of the course is partially based on the publication “A NetCDF version of the two-dimensional energy balance model based on the full multigrid algorithm” by Zhuang et al. (Software X, 2017). As a reference for the course, we have implemented the full climate model in our Julia code Klimakoffer.jl (https://github.com/klimakoffer/Klimakoffer.jl), where a short description can be found at https://www.mi.uni-koeln.de/NumSim/2021/09/30/snapshot-numerical-simulations-of-earths-climate/. However, we have re-structured the software for the course into several milestones to make it easier to digest in a step-by-step approach during the semester. These Python (Julia) reference solutions will be provided after each milestone.