Comment Re: Who thought this was feasible? (Score 1) 159
Concrete is interesting, because while it releases a lot of CO2 during production, it also absorbs it when it is curing.
But you still generally produce buckets of CO2 during the cooking process generating heat, so yeah, those bits could be replaced. I wouldn't worry about CO2 released from the chemical restructuring, because it'll just be absorbed again when you actually form and set the concrete.
The heating bit's around 4% of global emissions, so it's pretty close to the "don't worry about it" line, but we can probably green it up a lot with the right technology without much expense, so why not.
But it's pretty close to just being in the miscellaneous category.