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It changes the production process from producing Al+CO2 to Al+O2. That's a good thing for emissions reduction.

The power source for aluminium smelting is a separate question and can be replaced with renewables.




sadly not just any renewables - if the power goes off the Al in the pot lines hardens and ruins the hardware ... so solar and wind alone are out - geothermal and hydro (or those mixed with solar/wind) are OK




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