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Best of: Inside the stealth startup making zero-emission steel

Zero: The Climate Race

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How to Make Steel Without Emissions

Steel is one of the hardest to abate sectors and we produce about 1.9 billion tons of steel each year. The way that steel is made today is through a pyrometallurgy process that uses coal energy. We first melt the iron ore at about 1600 degrees Celsius, using coal as a source of energy. That carbon is also used to then refine or reduce or transform iron ore into pure iron.

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