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@Brendanjones

"And third, the technology Sublime uses to drive its chemical process — a device called an electrolyzer — has become much cheaper. Though electrolyzers have been around for a long time, they’ve recently benefited from increased economies of scale as interest in using them for applications like clean hydrogen production has grown."

sounds like it's driven by electricity, so the issue would be cost. there's a lot of grinding and heating in cement production. it's easy and cheap to throw fossil fuels at that. i hope they're able to get their process near enough to be economically competitive