"Production of anything, including hydrogen produces a lot of additional emissions"
Why would you say that? I mean, some sort of pollutant emission is inevitable in any heavy industry, but there's no physical reason it has to involve the transfer of carbon that's been locked under the ground for 100s of millions of years into the atmosphere, which is the only thing we really need to stop doing (unless some sort of process for extracting it from the atmosphere again at the same rate we add it is feasible, which isn't looking particularly likely).
Why would you say that? I mean, some sort of pollutant emission is inevitable in any heavy industry, but there's no physical reason it has to involve the transfer of carbon that's been locked under the ground for 100s of millions of years into the atmosphere, which is the only thing we really need to stop doing (unless some sort of process for extracting it from the atmosphere again at the same rate we add it is feasible, which isn't looking particularly likely).