RE: 1.4 trillion dollar investment required ...boom. miningSorry, couldn't help myself, just too easy here's and except of the article Mr V posted. He didn't mention this part for obvious reasons.
“A hydrogen ecosystem will also need to be developed for green steel, as decarbonisation will require around 50 million tonnes per annum of competitively priced green hydrogen, with commercial viability versus conventional steelmaking routes requiring green hydrogen supply at $2/kg,” Wu added.