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We're working towards carbon neutral steel, but not there yet. Here's an article https://www.newyorker.com/news/annals-of-a-warming-planet/th...

Yes maybe it's not quite full production ready yet, but it looks like it's very close, going by for example this https://www.treehugger.com/boston-metal-electrifies-steel-ma...

How long will it take to rebuild or refurbish every steel manufacturer

Probably quicker than a wholesale transition to 'wooden skyscrapers'.

Don't get me wrong I do like the idea, but I also see a place for 'green steel'.