Climate change, driven by rising CO2 levels, poses a critical global challenge. Portland cement production exceeds 4 Gt/year, with a projected 50% demand increase, significantly impacting this issue. Consequently, interest is growing in developing low-carbon cementitious binders to mitigate environmental effects. This study investigates vaterite, a metastable calcium carbonate polymorph, for its potential to enhance sustainability and performance in cementitious materials. Vaterite Calcined Clay Cement (VC3) is explored as a low-CO2 alternative to traditional cement, capable of sequestering approximately 0.44 kg CO2 per kg produced and exhibiting a lower manufacturing carbon footprint. Recent advancements have made large-scale vaterite production economically viable, contributing to substantial CO2 emission reductions.