I just read an estimate that said carbon adds 30% to the cost of producing the hydrogen alone (by electrolysis). If you can use smaller, simpler storage, transp

I just read an estimate that said carbon adds 30% to the cost of producing the hydrogen alone (by electrolysis). If you can use smaller, simpler storage, transport, and consumption structures (for CH4 over H2), that have lower safety demands, then it may be a wash. And those caverns, pipes and gas turbines are already there. Admittedly they depreciate at 4% - 14%, so not there for all that long in the scheme of things, but they're there now. And the manufacturing and regulatory infrastructures and engineering knowledge are there now too. At global scale.