Deal PaulVan,

Thank you for your question.

A well-established process to produce steel (Direct reduced Iron) requires the use of natural gas or coal as a reactant to reduce the iron ore to metallic iron. This produces CO2 in substantial quantities. The most important future development for this technology is to use only hydrogen as a reductant, eliminating all sources of carbon. However, the hydrogen must be heated to very high temperatures, something that plasma torches can do using only electricity as an energy source. 

Hope it helps,

Rodayna on behalf of Peter