like poorest concrete recycled materials and cement from plants. ah, hello and welcome to to morrow to day the science program on d. w. the construction industry is booming, more is being built around the world than ever before, with serious consequences for the environment. because almost everything is made from concrete containing the binding agent cement. the mind is made in special kills this combustion process, makes it a real climate killer. it s responsible for almost 10 percent of c o. 2 emissions caused by humans, but thus could hopefully change the carbon footprint of concrete could be reduced by using this material. expanded plain, small air filmed clay balls that are mixed in the concrete to reduce its weight. it also works with glass being the clue and the driver thing about both materials is helping corporate air into a solid structure. and the more air, the more finely distributed, the better the quality in the i m so so home in for light concrete contains so m