Rio Tinto aims to slash steelmaking CO2

Global mining company is investing $143 million into BioIron, a tech that uses biomass to reduce ironmaking carbon emissions by 95%.

From paper clips and surgical scalpels to skyscrapers and cargo ships, steel is a durable and abundant material that forms the framework for modern living. The process of transforming raw iron ore into steel, however, is responsible for around 8% of all global carbon...