What's standing in the way of sustainable steel?

Steel production is the surprising source of 8% of all greenhouse gases today. Most of it comes when converting iron ore into molten iron. Usually, that means with coal. Clean-burning hydrogen fuel, on the other hand, which produces only pure water as its byproduct, represents a far more sustainable alternative and would likely have been adopted long ago if not for technical challenges that continue to favor coal.

from Tech Xplore - electronic gadgets, technology advances and research news https://ift.tt/r5STvDs