'ABSOLUTE MIRACLE' BREAKTHROUGH PROVIDES RECIPE FOR ZERO-CARBON CEMENT

Summary from the TLDR newsletter

Old concrete can be recycled in steel-processing furnaces to purify iron, producing 'reactivated cement' as a byproduct. The process produces completely carbon-zero cement if renewable energy is used. The resulting concrete has similar performance to the original material. The technique doesn't add major costs to either concrete or steel production and it significantly reduces CO2 emissions compared to the usual methods of making both. Industrial-scale trials of the technology are set to begin soon.