Concrete is the single most abundant human-made material on Earth. It’s most likely beneath you right now. Some 70 per cent of the world’s population lives in a building made with concrete. Every year – and year after year – the world produces enough concrete to pave over the Great Lakes. But concrete is also catastrophic for the environment. According to UN data, the production of concrete is the source of 8 per cent of humanity’s carbon dioxide emissions. …But what if, rather than releasing carbon dioxide into the atmosphere, concrete absorbed it instead? One Canadian technology company has produced an alternative concrete that does exactly that. To make this special blend, “you get rid of the cement,” says Chris Stern, CEO of Montreal-based Carbicrete. …Carbicrete uses steel slag, a waste material from the steel-making process, to replace cement as a binding ingredient.