Academics from the University of Cambridge claim to have invented the world’s first ever process to produce zero-emission cement. Having secured a patent for their new approach, researchers are hopeful that the innovation will limit the need for green hydrogen to be used in the sector, allowing it to be prioritized in other ‘hard-to-abate’ areas. The new process uses waste concrete from the demolition of old buildings. This concrete is crushed, allowing the stones and sand constituents to be separated from the mixture of cement powder and water that bind them together. This recycled cement powder can then be used in the place of lime-flux in secondary steelmaking. With this used instead, a slag is formed on top of the…