NOVELTY - A process for generating electricity by coupling a hydrogen fuel cell to an enzymatic process, comprises catalyzing the hydration of CO2 to produce a solution containing bicarbonate ions and hydrogen ions, combining the hydrogen ions to form gaseous hydrogen, and supplying the gaseous hydrogen to the hydrogen fuel cell to generate electricity, is new.    USE - The method is useful for generating electricity using a hydrogen fuel cell.    ADVANTAGE - Gaseous CO2 emissions from processes such as hydrocarbon reforming are transformed into carbonate or bicarbonate ions and hydrogen ions by the enzymatic system in order to prevent their contribution to the greenhouse effect.    DETAILED DESCRIPTION - A process (I) for generating electricity, comprising:    (a) providing a hydrogen fuel cell requiring gaseous hydrogen to generate electricity;    (b) catalyzing a hydration reaction of CO2 to produce a solution containing bicarbonate ions and hydrogen ions;    (c) combining the hydrogen ions of step (b) to form gaseous hydrogen; and    (d) supplying the gaseous hydrogen obtained in step (c) to the hydrogen fuel cell to generate electricity.    An INDEPENDENT CLAIM is included for an electrical energy generating apparatus comprising:    (a) a hydrogen fuel cell requiring gaseous hydrogen to generate an electrical output;    (b) catalyzing means for catalyzing a hydration reaction of gaseous CO2 to produce a solution of bicarbonate ions and hydrogen ions;    (c) a combiner to combine the hydrogen ions into gaseous hydrogen;    (d) a transfer means for transferring the gaseous hydrogen from the combiner to the hydrogen fuel cell.    DESCRIPTION OF DRAWING(S) - The figure is a schematic representation of the inventive process. It shows the coupling of the enzymatic system with the hydrogen fuel cell as a closed loop, using gaseous CO2 emissions from methane reforming.    Anode (2)    Cathode (4)    External circuit (8)    Hydrogen fuel cell (10)    Enzymatic system (12)    Hydrocarbon reforming (14)    Water (16, 56)    Reformer (18)    Gaseous mixture (19)    Hydrogen (20, 34)    Carbon dioxide (22)    Solution containing water, bicarbonate and hydrogen ions (26)    Gas phase (28)    Precipitation process (30)    Combination process (32)    Bioreactor (40)    Gas inlet (42)    Liquid inlet (44)    Reaction chamber (46)    Liquid outlet (48)    Gas outlet (49)    Reaction tank (50)    Extraction device (60)