Methanol synthesis is not particularly difficult. Since you take the CO2 out of the air or water it's carbon neutral.

take the CO2 out of the air or water

any idea how much would that cost?

I made an estimate of the power required using zeolite as an absorber and it is not a lot. Others are working on this pretty hard. You can read my estimate here. I think the Navy considers dissolved carbon dioxide easier to work with.

Chris

i know nothing about zeolite. for the type that can trap CO2, what would be the cost, size and weight that can produce a tonne of CO2/day?