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Concrete is responsible for around 8% of global CO₂ emissions, but a new wave of “carbon-eating” technologies is challenging its reputation as one of the world’s dirtiest materials. From CO₂-injected mixes to limestone calcined clay cement (LC³), innovators are finding ways to lock carbon into concrete or reduce clinker use altogether. This article explores the science behind carbon-sequestering concretes, the promise and limitations of emerging solutions, and what it will take for these materials to move from pilot projects to mainstream construction.