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

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. […]




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The City Where Cars Are Not Welcome

HEIDELBERG, Germany — Eckart Würzner, a mayor on a mission to make his city emission free, is not terribly impressed by promises from General Motors, Ford and other big automakers […]