One simple step towards a solution would be to mandate green steel for government projects. Bridges, guard rails, buildings, snow plows, school busses, etc. You

One simple step towards a solution would be to mandate green steel for government projects. Bridges, guard rails, buildings, snow plows, school busses, etc. You'd create a multi-billion dollar market instantaneously and have all the VCs and private equity folks piling into new research and development. That would help drive down the price for future non-governmental purchases. Also, at a large enough scale, your concerns about makers steel products going out of business if they can't use high-emission steel go away. If the entire EU mandated it, or the US, it would still work.