NOVELTY - Producing synthetic fuel (202) involves thermally reforming methane and carbon dioxide to generate syngas (212) including first quantity of carbon monoxide and hydrogen; oxidizing carbon monoxide with metal to produce metal oxide and carbon, and separating oxygen from carbon monoxide; gasifying carbon using steam to produce carbon monoxide and hydrogen; reacting metal oxide with methane to produce metal oxide, carbon dioxide, and third quantity of hydrogen; and reacting first quantity of carbon monoxide and hydrogen, and second and third quantity of hydrogen to form synthetic fuel.    USE - For producing synthetic fuel e.g. methanol (CH4O), ethylene (C2H4), ethanol (C2H6O), and butanol (C4H10O) (claimed).    ADVANTAGE - The method uses biogas as the feed source and effectively produces synthetic fuel. The method generates 0.475 to 0.645 moles of carbon dioxide (CO2) for every mole of methanol produced, which is lower than SRM (steam reforming of methane). Thus, by using carbon capture and storage (CCS) technologies, the emissions profile can be reduced and/or other feed sources can be utilized while operating at a lower emissions profile than SRM and other known technologies.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a system (200) for producing synthetic fuel comprising: a reformer reactor (204) for thermally reforming methane with carbon dioxide to produce a first quantity of carbon monoxide and hydrogen; an oxidation/reduction reactor (206) for oxidizing quantity of first carbon monoxide with a metal (220) to produce metal oxide and carbon, thus separating oxygen from carbon monoxide, for gasifying carbon using steam (222) to produce a second quantity of carbon monoxide and hydrogen, and for reacting metal oxide with methane to produce metal oxide, carbon dioxide, and a third quantity of hydrogen; a carbon dioxide capture module (208) for capturing carbon dioxide produced by oxidation/reaction reactor; and a synthesis reactor (210) for synthesizing first quantity of carbon monoxide, first quantity of hydrogen, second quantity of hydrogen, and third quantity of hydrogen to form synthetic fuel.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of the device.    System (200)    Synthetic fuel (202)    Reformer reactor (204)    Oxidation/reduction reactor (206)    Carbon dioxide capture module (208)    Synthesis reactor (210)    Syngas (212)    Metal (220)    Steam (222)