Major truck manufacturers like Volvo and MAN are spearheading the development of hydrogen combustion engines as a low-emission alternative to diesel for heavy-duty vehicles. This approach, as reported by Reuters, aims to utilize existing production lines, providing a more efficient and cost-effective way of reducing emissions in the transportation sector. The industry is facing hurdles with battery-electric trucks due to their weight and long charging times. In contrast, hydrogen fuel cells, although lighter, require new vehicle systems. MAN is set to conduct tests on about 200 hydrogen-powered trucks with European customers next year, while Volvo plans to start customer trials by 2026, indicating a shift towards hydrogen technology. The integration of hydrogen combustion engines into current manufacturing processes not only helps in preserving jobs but also makes use of the existing infrastructure. Cummins is also working on a fuel-agnostic engine family that can share common components. However, challenges remain, such as the need for emissions filtering and safety concerns related to pressurized hydrogen tanks. The industry is also facing issues with the limited availability of green hydrogen, essential for a complete transition to low-emission vehicles. As an interim solution, some manufacturers are considering natural gas or biogas until a transition to hydrogen becomes feasible. Funding from entities like the European Union and the United States is aiding in the development of green hydrogen infrastructure, though progress is slow. Despite these obstacles, hydrogen combustion engines offer a practical step towards emission reduction by utilizing familiar technology and existing production capabilities. This article was jointly created using AI and then extensively revised by the editorial team.