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about 4 years ago US energy research lab in NM published paper on $4 gal gas from C02 in air. Methane to gasoline has been done in past, Exxon had plant in Phillipines.
Catch was that to get enough energy to make gas w/o co2 emmissions, you are talking nuke plant or huge solar. Co2 to gas would be carbon neutral - think about it. By the was, gas is a really great, portable, high energy fuel: safer than a high pressure hydrogen "bomb" in yout trunk/boot.