2CO, + H,O + CaSiO, -> Ca'+ + 2HCO,-+ SiO, -29.6 kcal Underlined digits are lost after copypaste. So in the end you have Calcium bicarbonate that becomes unsoluable carbonate in the end. Its just proof of concept, in the terraforming scales(time + volume of chemicals) it can work, but dropping dust on fields seems like joke

Concrete production emmits 8% of the world co2 pollution. Man-made concrete doesnt help us in this way

Does producing concrete use fossil fuels? Not for energy, but in the actual chemical process, like plastic does.

Carbon dioxide is emitted as a by-product of clinker production, an intermediate product in cement manufacture, in which calcium carbonate (CaCO3) is calcinated and converted to lime (CaO), the primary component of cement.[1]

[1] https://www.ipcc-nggip.iges.or.jp/public/gp/bgp/3_1_Cement_P...