This is one of many creative ways of getting rid of direct fossil fuel use in industry and in the economy overall. We need ways to make steel, cement, and fertilizer with alternative processes that do not contribute to greenhouse gas emissions, and techniques like these are extremely useful. They will make a transition away from fossil fuels possible. But all these processes require heat and electricity. The root energy source used to do all these things needs to decarbonized. That's the really big challenge.