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In the city of Duisburg in Germany’s industrial heartland is a vast steel complex that is one of Europe’s largest polluters. But alongside the mill’s furnaces and smelters, technicians have developed a machine that could soon play a vital role in reducing greenhouse gas emissions.
By using electricity to split water into its two elements, the device, a test model called an electrolyzer, produces hydrogen, a carbon-free gas that could help power mills like the one in Duisburg. If adopted widely, the devices could help clean up heavy…