Iron and steel production are two of the most carbon-heavy industries, but efforts to make these materials without fossil fuels are finally gathering momentum. A company in Sweden called H2 Green Steel says it will start producing green steel commercially in late 2025, and it is just one of several working on this.

“If you really want to make an impact, you should start with decarbonising steel,” Lina Håkansdotter of H2 Green Steel told a press briefing in Stockholm …