Calcium bicarbonate reactors using limestone are already used by mollusk farmers to increase the saturation state of calcium in the water and to counter ocean acidification caused by CO2 (which forms carbonic acid as it dissolves into the water). Using limestone calcium reactors, just the limestone waste from quarry activity could more than remove all the industrial CO2 emissions from the atmosphere and safely store it in the ocean
Oceanic diatoms would then use it to form their shells, and the settling of the microscopic shells to the ocean floor would store away the carbon for thousands if not millions of years. The problem is that the concentration of CO2 in the atmosphere is too low to make capturing it in water or sea water cost-effective. To make this cost-effective, a concentrated source of CO2 is needed.
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