Method of operating an internal combustion engine of a truck or omnibus

A method for operating an internal combustion engine of a truck or bus having at least a 3.5 tonne total mass comprising:

• splitting water into hydrogen and oxygen in an electrolysis unit configured for production of hydrogen;
• extracting carbon dioxide from ambient air at a carbon dioxide sorption unit;
• feeding the hydrogen and the carbon dioxide to a methanol synthesis unit configured for the production of methanol, wherein the methanol synthesis unit synthesizes the hydrogen and the carbon dioxide into methanol;
• and converting absorbed solar energy at a photovoltaic unit into electrical energy, wherein the electrolysis unit, the carbon dioxide sorption unit and the methanol synthesis unit are operated by the electrical energy generated in the photovoltaic unit, wherein the methanol is transported by a distribution system to a tank of the truck or bus, and wherein the methanol is supplied from the tank as fuel for combustion to the internal combustion engine for generation of mechanical energy to a hybrid drive train of the truck or bus, wherein the water is desalinated in a seawater desalination unit and fed to the electrolysis unit, wherein the seawater desalination unit is operated by the electrical energy generated in the photovoltaic unit, wherein a hydrogen storage unit enables feeding the methanol synthesis unit with hydrogen continuously, wherein the carbon dioxide sorption unit maintains a closed-loop carbon dioxide cycle with the ambient air and methanol combustion with carbon neutrality.