The trucking industry is undergoing a significant shift towards adopting hydrogen combustion engines as a low-emission alternative to traditional diesel engines. Major manufacturers like Volvo and MAN are at the forefront of this transition, aiming to leverage existing production lines to quickly and cost-effectively reduce emissions. The industry is finding hydrogen combustion engines more appealing than battery-electric trucks due to challenges like weight and long charging times associated with the latter. MAN plans to initiate trials with around 200 hydrogen-powered trucks in Europe, while Volvo targets customer trials by 2026. The advantage of integrating hydrogen combustion engines into existing manufacturing processes lies in preserving jobs and utilizing current infrastructure. However, these engines are not without challenges. Emissions filtering is required, and the need for larger pressurized hydrogen tanks raises safety concerns. An additional hurdle is the limited availability of green hydrogen, crucial for a complete transition to low-emission vehicles. Some manufacturers are considering interim solutions like natural gas or biogas before transitioning to hydrogen. Efforts by the European Union and the United States to fund the development of green hydrogen infrastructure are underway, although progress remains slow. Despite the obstacles, hydrogen combustion engines are viewed positively for providing an immediate solution to emission reduction through familiar technology and existing production capabilities. Cummins, for example, is focusing on a versatile engine family that can accommodate different types of fuels. This shift signifies a crucial step in the trucking industry's journey towards a more sustainable and environmentally friendly future.