mixture of rocks, sand, water and cement to bind it all together. but cement has a huge carbon footprint. one pound of cement releases one pound of co2 emissions, without cement, concrete doesn't hold up skyscrapers. but a company called carbon cure developed technology to reduce cement's carbon footprint by using co 2 in the concrete mixing process. this is what's different about the operation? >> this is the brains of it here. >> reporter: after capturing co2 off site, it is brought to companies like thomas concrete. it is directly injected as it is mixed which makes the concrete stronger. when the concrete hardens, otherwise harmful emissions are sequestered forever, before they even reach our atmosphere. this building behind us is all built using carbon cure concrete. >> that's right. 48,000 cubic yards.