Still leagues ahead of biomass. Don't get me wrong, this is an issue that can be solved. Biomass can be converted to biogas which can be purified to produce methane (or you just burn biogas directly) which then in turn can be used for heat (or other purposes) - the problem here is the sheer amount of energy this requires. Yes, significant portions of the steel industry can be "decarbonised" (or at least I think so) but the effort is immense. Doable, necessary, but it will be a huge piece of work.