Most concrete produces pollution. This concrete is made of it

Concrete is the world’s most widely used building material, and it’s also one of the world’s biggest sources of carbon emissions. The production of all the concrete for our sidewalks, buildings, and bridges is responsible for about 8% of the carbon dioxide emitted into the atmosphere globally. In the face of a changing climate, the material that builds our world is the same one destroying it.  A new type of concrete aims to reverse that cycle. Researchers at the University of Tokyo have developed a form of concrete that is made using waste from previously used concrete combined with carbon dioxide pulled from the air. - Fast Company