Make CO₂ emissions factor configurable #3290
Merged
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I love the CO₂ reduction feature, but it is not configurable, and set to the German factor, which is, to be honest, quite high (thanks Grünen).
This PR allows the factor to be set as an ENV variable. Ideally it would work just as the energy prices, with a set start date for the calculations, so that you can update it when new energy sources are introduced, but that is too much work for now. I might look further into in the future, but for the time being this works.
Also fixes a typo with the constant name.