On he other hand, hydrogen requires thicker insulation including on the starship/booster itself, or pressure vessels everywhere, better cooling etc., All kinds

On he other hand, hydrogen requires thicker insulation including on the starship/booster itself, or pressure vessels everywhere, better cooling etc., All kinds of additional things that need to be manufactured and maintained and that emits plenty of CO2 in today's economy and near future. Manufacturing green hydrogen is very akin to green CH4, so that cancels out. It's very likely we will need huge CO2 capture capacity anyway for other reasons, so offsetting rocket launches will then become marginal. And releasing CH4 on launch looks like a technical problem, not a fundamental one. Release additional oxygen so that everything burns completely further below the engine. I don't think Mars manufacturing will make any change in Earth greenhouse gases emissions, or do i miss something?