Achieving the expected, long-term goals related to emission reduction is a key ambition that will entail not only methodical, cutting-edge investigations into new power systems and alternative fuel technologies but also securing broad-based industry adoption. Marine Propulsion for Decarbonization provides essential information for the marine shipping sector to undergo a systemic transformation. The book sets the scene through an overview of the current status and prospects of trade flows as well as regulations in support of global sustainable development targets and the fight against climate change that are shaping them. It then goes on to examine state-of-the-art propulsion advancements, with a thorough analysis of internal combustion engine components and their optimized design depending on the alternative fuel that is being used. Technical discussions on various zero- or low-carbon fuels properties and combustion characterization are included alongside a description of the most effective emission after-treatment solutions. The volume is concluded with an examination of ship electrification and the steep technological hurdles the industry still faces. The comprehensive excursus offered by the highly expert, international group of authors behind the book ensures that instrumental knowledge is made available for readers both in academia and professional settings to accelerate the pace of the global energy transition and the decarbonization of the global economy.