We've documented multiple United States Patents, held both by domestic petroleum corporations and foreign nationals, detailing how Methane can be converted into liquid hydrocarbons from which liquid transportation fuels can be refined.
Of most interest to us, herein, keeping in mind that Methane can be synthesized, via the Nobel-winning Sabatier process, from Carbon Dioxide; and, via hydro-gasification techniques, from Coal; is that the Methane, as in Penn State University's Tri-reforming technology and in at least one US-patented Korean version of Tri-reforming, is combined with additional Carbon Dioxide to effect it's conversion into synthesis gas, "Syngas".