Cement is the modern world's most common construction material, but it is also a huge source of planet-warming gas emissions.
It is what binds the sand and aggregate in concrete together, and concrete is the most widely used material on the planet after water. When you recycle steel, you add chemicals that float on the surface of the molten metal to prevent it reacting with the air and creating impurities. This is known as slag.
The lead scientist, Cyrille Dunant, told the BBC it could enable the production of zero-carbon cement.
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