Helix Carbon says it can make iron cheaper by recycling blast furnace pollution

The iron and steel industries are among the biggest polluters in the world. Plenty of startups have tried to cut the industry’s emissions, mostly by developing new ways to make the metals. Helix Carbon thinks those startups have been going about it all wrong. “Any attempt to decarbonize the steel industry without dealing with the blast furnace is not going to work,” David Brown, Helix Carbon’s co-founder…