> Iron oxide can also be reduced to iron using hydrogen > Altiro gets around this problem by adding a little natural gas This is transparently just green wash

> Iron oxide can also be reduced to iron using hydrogen > Altiro gets around this problem by adding a little natural gas This is transparently just green washing from the fossil fuel industry. There is no way that this will be an efficient energy storage mechanism and it definitely won't be carbon neutral. Developing cost-effective methods to produce steel from iron ore without the use of coke (coal) is important, but if you want to do that just do that.