[froh]

ok so your cement does not expose additional co2 from the lime-to-quicklime transformation, instead it takes co2 from the oceans. that is released to zhe athmosphere during cement production. and that co2 from the air is then recaptured by the ocean. so your process creates a ocean-co2 -> air -> ocean cycle.

and when and where the hydrogen is replacing some carbon based fuels, somehwere, that counterbalances the carbon based fuel used in the cement furnace.

now I get how it becomes carbon neutral overall.

do you guys have data points at hand how long it takes for an ocean to recapture the co2?