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How to Clean Up Steel? Bacteria, Hydrogen and a Lot of Cash.

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Few materials are more essential than steel, yet steel mills are among the leading polluters. They burn coke, a derivative of coal, and belch millions of tons of greenhouse gases. Roughly two tons of carbon dioxide rises into the atmosphere for every ton of steel made using blast furnaces.With climate concerns growing, a crunch appears inevitable for these companies. Carbon taxes are rising, and investors are wary of putting their money into businesses that could be regulated out of existence.None of this has been lost on the giant steel maker ArcelorMittal.For half a century, Lakshmi Mittal devoted …

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