@kirschwipfel The latter is also reason why solar/wind are so expensive in terms of natural resources needed for construction. You need ~120 wind turbines with 100 m wings to replace one 400 MW power plant running nuclear, gas or coal. You need *a lot* of steel, concrete and rare earth metals for construction.

Current global rare earth metals production is 180 kt per year. To go 80% renewable we would need 5400 kt per year. Where do we take it from?