The Indian iron and steel sector is responsible for 12% of total CO2 emissions, making it the highest emitting industrial sector in the country. During the steel production process—which involves mining iron ore, processing this ore into pure iron, which is then turned into different grades of steel—it is the iron processing step that is responsible for most emissions. In India, this typically covers two routes: the blast furnace, used in larger plants, and coal-based rotary kilns, popular among small-scale players.