> For steel the possibilities are hydrogen or electrolysis, both are being tested by some companies. We already have steel recycling plants today that shift ~1

> For steel the possibilities are hydrogen or electrolysis, both are being tested by some companies. We already have steel recycling plants today that shift ~100% of emissions to thermal energy source, with a hot enough nuclear reactor (G4 MSR, maybe something in fast spectrum, maybe fusion) you can effectively eliminate the majority of steel emissions globally. > Cement is the biggest "we don't really have any good alternative, at least not any time soon"-issue. Bill Gates posted about this recently [1,2] [1] https://www.gatesnotes.com/Energy/Buildings-are-good-for-people-and-bad-for-the-climate https://www.gatesnotes.com/Energy/Buildings-are-good-for-peo... [2] https://www.carboncure.com/ https://www.carboncure.com/