A method of producing carbon carbonate from the exhaust 2 of an engine 1 a vehicle (e.g. ship, train trucks) comprises treating the exhaust gas to remove particle matter, sulphur dioxide (SO2) and carbon monoxide (CO); passing the gas through a condenser to separate demineralised water from the gas that is stored in a reservoir 40. The nitrogen/carbon dioxide rich gas is cooled 13 and passed to a catalysed carbon capture system comprising a hydration tank 21 containing water and nickel nanoparticles through which the gas is bubbled and converted to carbonic acid (CO3H2); a separator 32 to remove the nanoparticles; a settling tank 41 where sodium hydroxide (NaOH) and calcium chloride (CaCl2) is added to the acid to produce carbon carbonate at a temperature below 1400 centigrade. The carbonate may be disposed of at sea. The reclaimed water may be used to emulsify the engine’s fuel 16, used as part of a humid air motor system; or used to supply the vehicles water supply e.g. drinking water. Alternatively reactors having microbes, enzymes or electro chemical synthesis of calcium carbonate may be used to capture carbon dioxide. The exhaust gas may also be purified with a CO2 scrubbing device.
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