This assumes that we reverse the reaction. That does not need to be the case. We can put it back into the ground. It can either stay where natgas or crude used to be or we can basically turn that into rock (don’t know details but there is a process to do that). Or it can be put in salt caverns.

Either way we still need to capture the CO and CO2 from flue gas which is costly even from point sources and way worse from DAC. Unless we do oxyburning or fosil fuels which is a hack but you need a source of cheap oxygen which we don’t have unless we dramatically scale up electrolysis.