Cement is a vital building material, but one that emits copious amounts of CO2 during its production. Caldera, a company based in California, claims it has created a process that produces cement while reducing CO2 in the air.
The company takes smoke stack emissions from nearby power plants and runs the CO2 through brackish water. The minerals in the water bond with the CO2 to precipitate out limestone, in a similar way to how limestone is created naturally. The end product is cement, hard aggregate, and water that is already one step towards being purified for drinking.
Caldera is now expanding production and preparing to test its cement with industry partners. If the process works, and is economic, then concrete may be the next big green building material.
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