In the US, no new blast furnaces have been built in decades; they’re all mini mills and/or direct reduction furnaces and yeah, the latter use natural gas. But a

In the US, no new blast furnaces have been built in decades; they’re all mini mills and/or direct reduction furnaces and yeah, the latter use natural gas. But again, you could use electrolytically producers hydrogen. There’s no reason to use steam reformed hydrogen except it’s currently cheaper.