The different metal and energy models exemplified here are all part of a larger programme, where we are building a global systems model called WORLD. The WORLD model attempts to model the world systems in a way similar to what the World3 model (Fig. 4.1) once did (Meadows et al., 1972, 1992, 2004; Randers, 2012), however, with a more complete description of each individual and significant resource. Figure 4.2 shows an overview of the most important modules in the WORLD model. It takes several parts from World3, but has the resource part...

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