It is the most precise measurement of the energy input required chemically. It says nothing of the efficiency of the process. The energy required to get to 21 b

It is the most precise measurement of the energy input required chemically. It says nothing of the efficiency of the process. The energy required to get to 21 bar and 300-500C and maintain it while that energy input is being provided for that specific chemical reaction. I'll reiterate, I have no issue that it's inefficient, that's to be expected. It's not hard at all to give a net energy input for the entire process. In fact that would be the easiest part of the paper. If you're giving your research to your press office to make a statement about "climate protection" I damn well expect that number to be provided. Powered by nuclear as you propose is wonderful, btw. I personally would take nuclear waste over atmospheric CO2 every day of the week.