NOVELTY - Oxidative combustion of organic material/fossil fuel (1) (F1) by passing at least formed carbon monoxide, carbon dioxide and water in three-step catalytic gas reactor (5) involves (A) passing through catalyst (3)/membrane for combustion of (F1) by reacting methane and oxygen to form carbon dioxide and water; (B) passing through second catalyst/membrane that splits water into hydrogen and oxygen; and (C) passing through catalyst forming methane resulting in reaction of carbon monoxide and 3 molecules of hydrogen and carbon dioxide and 4 molecules of hydrogen to give methane and water. An INDEPENDENT CLAIM is included for solid oxide fuel cell reactor comprising three steps separately performing the reactions for combustion of organic material/fossil fuel by using oxygen where at least formed carbon monoxide, carbon dioxide and water is passed into a three-step catalytic gas reactor in which steps (a)-(c) are performed.    USE - For oxidative combustion of organic material/fossil fuel in solid oxide fuel cell reactor (claimed) useful for producing energy in the form of electricity and/or heat, and also useful in other processes where natural gas or other hydrocarbons and organic compounds are one of the raw materials.    ADVANTAGE - The method provides oxidative combustion of organic material/fossil fuel that utilizes electricity at high efficiencies and/or heat; helps to transform carbon dioxide to methane through the aid of hydrogen that used again as a fuel or as a raw material for a number of other processes; produces energy far more effectively than similar processes today, and has far lower carbon dioxide emission per kWh than contemporary processes with carbon dioxide harvesting; provides the industrial way of controlling the physical and chemical parameters; provides catalytic and physical characteristics that allows and emphasizes the hydrogenation of carbon dioxide to methane.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the solid oxide fuel cell-catalytic carbon dioxide recirculation technology in any power-producing plant based on fossil/organic fuel.    Organic fuel (1)    Air (2)    Catalyst (3)    Reactor (5)    Inert gas (7)