TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Process: The process comprises reforming hydrocarbons to yield a gaseous mixture comprising hydrogen and CO2, and extracting gaseous hydrogen from the mixture and supplying the gaseous hydrogen to the hydrogen fuel cell. The process comprises extracting gaseous CO2 from the mixture and recycling at least a portion of the extracted gaseous CO2 in the catalyzing step.The hydration is catalysed by an enzyme capable of catalyzing the hydration of dissolved CO2 into hydrogen ions and bicarbonate ions. The enzyme is carbonic anhydrase or its analogue. The enzyme is immobilized on or entrapped in a support. Step (b) of catalyzing comprises feeding liquid H2O and at least portion of the extracted gaseous CO2 into a bioreactor containing a reaction chamber filled with the carbonic anhydrase.The hydrogen fuel cell also generates, in step (d), water that is recycled and used in the catalyzing step (b). (I) further comprises adding metal ions to the solution obtained in step (b), and adjusting the pH of the solution to precipitate a carbonate or a bicarbonate of the metal. The metal ions are selected from Ca++, Mg++, Ba++, and Na+.Step (c) comprises the step of adding to the solution of bicarbonate ions and hydrogen ions obtained in step (b) an electron donor. The electron donor is a metal. The metal is selected from zinc, magnesium, copper, aluminum, iron or tin.(I) further comprises reforming hydrocarbons to yield a gaseous mixture comprising hydrogen and CO2, and recycling the gaseous mixture to the catalyzing step (b).Preferred Apparatus: The means for catalyzing the hydration of the CO2 comprises:(a) a bioreactor comprising a gas inlet for receiving a gas containing CO2,(b) a liquid inlet for receiving an aqueous liquid,(c) a reaction chamber in fluid communication with the gas inlet and the liquid inlet, the reaction chamber containing enzymes capable of catalyzing the hydration of dissolved CO2 into bicarbonate ions and hydrogen ions, and(d) a liquid outlet in fluid communication with the reaction chamber for discharging a solution of bicarbonate ions and hydrogen ions, and the apparatus comprises a transfer means for transferring the solution of bicarbonate ions and hydrogen ions from the liquid outlet to the combiner.The apparatus comprises a reformer to reform hydrocarbons, thus yielding a gaseous mixture containing hydrogen and CO2, an extracting means for extracting gaseous hydrogen from said gaseous mixture, and a transfer means for transferring the gaseous hydrogen from the extracting means to the hydrogen fuel cell.The extracting means comprises means for extracting and separating gaseous CO2 from the gaseous mixture, and the apparatus comprises a fourth transfer means for transferring the gaseous CO2 from the extracting means to the gas inlet of the bioreactor. The apparatus further comprises a transfer means for transferring water produced in the hydrogen fuel cell to the liquid inlet of the bioreactor. It also comprises means for reacting the bicarbonate ions, which are contained in the solution discharged from the bioreactor, with metal ions to precipitate the carbonate of the metal. The apparatus also comprises a reformer to reform hydrocarbons, thus yielding a gaseous mixture containing hydrogen and CO2, and a transfer means for transferring the gaseous mixture to the gas inlet of the bioreactor.    TECHNOLOGY FOCUS - BIOLOGY - Preferred Process: The hydration is catalysed by an enzyme capable of catalyzing the hydration of dissolved CO2 into hydrogen ions and bicarbonate ions. The enzyme is carbonic anhydrase or its analogue. The enzyme is immobilized on or entrapped in a support.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process:The hydrogen fuel cell also generates, in step (d), water that is recycled and used in the catalyzing step (b). (I) further comprises adding metal ions to the solution obtained in step (b), and adjusting the pH of the solution to precipitate a carbonate or a bicarbonate of the metal.The metal ions are selected from Ca++, Mg++, Ba++, and Na+. Step (c) comprises the step of adding to the solution of bicarbonate ions and hydrogen ions obtained in step (b) an electron donor. The electron donor is a metal. The metal is selected from zinc, magnesium, copper, aluminum, iron or tin. EXAMPLE - No relevant example given.