Solarpunk technology

Unfortunately, it's vital for steel production since it's a reducing agent and used in blast furnaces. There are other options out there but they are pretty far from being implemented AFAIK

They're investing in "green metal", using their own renewable generation to produce hydrogen.

Whether or not it works out is another matter, but he (Andrew Forrest) seems to believe in it and is willing to put his money where his mouth is.