Japanese construction firms are hoping to cut carbon emissions by moving away from conventional concrete to more environmentally-friendly versions.
Taisei has come up with an offering that abandons emissions-heavy cement. Instead it contains calcium carbonate, a substance created by trapping carbon dioxide.
Officials at the company say one cubic meter of their concrete can hold 170 kilograms of the greenhouse gas.
Another firm, Kajima, is already using concrete directly infused with CO2 in roads and parking lots. The firm is now investigating ways to use it in buildings.