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[Phys-L] substitute for coal (carbon) in smelting

Phys-l’ers and friends (Bcc’d):

Intuitively, I thought we're stuck producing CO2. But, so I thought, what other reducers are there, and will “creating” them also produce CO2 (or methane).

Here’s an article that is very complete, which I’ve only skimmed (it’s v. long); gentle readers please comment for my benefit, so I may get back to decluttering our home.