NOVELTY - Apparatus for producing a product comprising a hydrocarbon and hydrogen gas, comprises a reaction vessel (13) for containing a reaction mixture of a gaseous carbon source (W1) with n carbon molecules consisting of methane and carbon dioxide from the atmosphere and water and having a catalyst and at least one microwave energy source, where the reaction mixture of the gaseous carbon source (W1) is reacted in the presence of the catalyst and thermal energy to give hydrocarbon and hydrogen gas. The catalyst consists of iron-, cobalt-, copper- and nickel-containing compounds.    USE - The apparatus is useful for producing a product comprising a hydrocarbon and hydrogen gas (claimed), preferably for converting carbon dioxide and/or methane into alkane and hydrogen gas in a single reaction chamber, where the hydrocarbon is useful as feedstock in oil refineries.    ADVANTAGE - The apparatus consumes carbon dioxide to remove the gas from the atmosphere to reduce its effect on climate change thus reliably and economically converting low value and widely-available methane to higher value hydrocarbons and/or hydrogen gas, and reduces the carbon footprint of installations such as coal fired power plants to improve their environmental performances.    DETAILED DESCRIPTION - Apparatus for producing a product comprising a hydrocarbon of formula (CnHz) and hydrogen gas, comprises a reaction vessel (13) for containing a reaction mixture of a gaseous carbon source (W1) with n carbon molecules consisting of methane and carbon dioxide from the atmosphere and water and having a catalyst and at least one microwave energy source, where the reaction mixture of the gaseous carbon source (W1) is reacted in the presence of the catalyst and thermal energy to give hydrocarbon and hydrogen gas of formula (yH2). The catalyst consists of iron-, cobalt-, copper- and nickel-containing compounds. At least one selected catalyst, upon microwave radiation, increases in temperature to produce thermal energy. The microwave energy source is capable of placing thermal energy to the catalyst and to the reaction mixture to produce at least one hydrocarbon composition and hydrogen gas.    n = greater than 1;    z = 2n+2 and 2n; and    y = 0 or a positive integer to balance the hydrogen.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an apparatus for producing product comprising a hydrocarbon and hydrogen gas.    Reaction vessel (13)    Walls (15)    Chamber (17)    Fixed catalyst bed (19)    Output conduit (31)    Separation vessel. (33)