Nuclear, wind, hydro, and geothermal (and maybe some biomass) produce about 40% of the electricity in the US. And yeah, if we’re just using grid electricity at the current electricity mix to make hydrogen, we’re not any better off than using steam reforming. That’s a very valid point. But it’s relatively straightforward to decarbonize the grid. Just build more solar, wind, geothermal, and nuclear and keep what we’ve already got running. Retire coal ASAP.