The London 2012 Olympic Stadium is the most sustainable ever built. With steel a resource in short supply, the build was made 75%  lighter in terms of steel use than other stadiums. It also features a low-carbon concrete, made from industrial waste and containing 40 per cent less embodied carbon than usual. The Olympic Stadium will host the Athletics and Paralympic Athletics events at the London 2012 Games, as well as the Opening and Closing Ceremonies.