‘Green steel’ heating up in Sweden’s frozen north

Susanne Rostmark, research leader, LKAB, holds a piece of hot briquetted iron ore made using the HYBRIT process nearby the venture’s pilot plant in Lulea, Sweden on Feb. 17, 2022. The steel-making industry is coming under increasing pressure to curb its environmental impact and contribute to the Paris climate accord, which aims to cap global warming at 1.5 degrees Celsius Credit: James Brooks via AP

For hundreds of years, raging blast furnaces—fed with coking coal—have forged steel used in cars, railways, bridges and skyscrapers.

But the puffs of coal-fired smoke are a big source of carbon dioxide, the heat-trapping gas that’s …

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