One important development that will make internal combustion engines more sustainable is to run them directly on hydrogen, rather than fossil fuels. This will have a huge impact on carbon emissions, which will be reduced by over 99%. We are researching the mono-fuel and dual-fuel variants. Advantages of this technology include rapid market availability through the leveraging of existing production and service lines, low costs, insensitivity to hydrogen purity, and finally, geographical independence in terms of the materials needed.