A number of steelmakers are experimenting with low-carbon technologies that use hydrogen or electricity instead of traditional manufacturing.

In the city of Woburn, Massachusetts, a suburb just north of Boston, a cadre of engineers and scientists in white coats inspected an orderly stack of brick-sized, gunmetal-gray steel ingots on a desk inside a neon-illuminated lab space.

What they were looking at was a batch of steel created using an innovative manufacturing method, one that Boston Metal, a company that spun out a decade ago from MIT, hopes will dramatically reshape the way the alloy has been made for centuries. By using electricity to separate iron from its ore, the firm claims it can make steel without releasing carbon dioxide, offering a path to cleaning up one of the world’s worst industries for greenhouse gas emissions.

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