Hydrogen combustion has emerged as a promising fuel option, with engines dating back to 1970 when Paul Dieges patented a modification for gas-powered internal combustion engines to run on hydrogen. Today, the technology has advanced significantly, with hydrogen being considered for vehicles, cars, buses, and potentially even commercial aircraft. Cummins' 15-liter hydrogen engine platform is designed to be fuel-agnostic, capable of running on hydrogen, natural gas, and diesel. This engine is set to revolutionize heavy-duty off-highway applications by offering low-to-zero carbon fuel capabilities, accelerating decarbonization in the industry. The engine, expected to be in full production by 2027, has garnered industry validation, with Werner Enterprises beginning validation and integration processes. Yamaha's collaboration with Toyota resulted in the development of a 5.0-liter V8 hydrogen-powered engine, emphasizing the potential for carbon-neutral internal combustion engines. The engine, based on the Lexus RC F luxury sport coupe, delivers impressive power and torque figures, showcasing performance while aiming for carbon neutrality. BMW's testing of the iX5 Hydrogen vehicle in extreme conditions demonstrates the adaptability and reliability of hydrogen fuel cell technology for everyday use. The fuel-cell system in the iX5 Hydrogen consistently delivers high output, with components manufactured by Toyota, combined with BMW's Gen-5 range of eDrive technologies. Collaborative research by Yamaha, Kawasaki, Subaru, Mazda, and Toyota aims to expand fuel options for internal combustion engines to achieve carbon neutrality, showing a commitment to innovation in transportation and environmental sustainability.