Comment by nine_k
3 hours ago
You can have 100% renewable energy. You can't realistically produce cement or steel without using and exhausting large amounts of CO2. This has to be addressed, even if it costs energy (which, as we agreed, can be 100% carbon-neutral).
there is no world in which it is cheaper to produce steel releasing CO2 and recapturing than fobbing off recapture until later. the thermodynamics just don't work.