Turning CO2 into chalk and sand

Removing carbon dioxide from smokestacks and storing it permanently is one of the possible solutions to global warming, but remains expensive to do. A new technique could make carbon sequestration economical on a large scale, while producing useful materials on the side.

Dirk Van Essendelft, a chemical engineer at PennsylvaniaStateUniversity in University Park, described the method on August 19 in Philadelphia during a meeting of the American Chemical Society.