Ferrock is a proposed substitute for traditional cement that could significantly reduce greenhouse gas emissions. It is composed partly of recycled steel dust and captures between 8-11% of its weight in CO2 as it cures. Tests show Ferrock has stronger compressive and flexural strength than Portland cement. Researchers are studying its potential to make structures like building columns more blast resistant, helping to save lives in disasters. Adopting Ferrock could help cement-producing countries like India and China move to a more sustainable future.