Comment by pfdietz

One can make natural gas from CO2 captured from air and with hydrogen electrolysed form water. But then one has to ask: why not just use hydrogen directly and skip the inefficiency and cost of direct air capture of CO2 and of making methane? If one is dead set on making a carbon-containing synfuel, why methane and not something more storable, like methanol or higher hydrocarbons? Or, why not use the hydrogen to deoxygenate biomass (including waste biomass like paper) instead of laboriously collecting completely oxidized CO2 from air?