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註釋This is the second iteration of the Technology Development Report for Advanced Alternative Fuels. As will be seen from this report, the fuel production pathways studied tend to be 'ground-breaking' or relatively new, with much work being carried out at laboratory scale. While that means projects tend to be at low-TRL, it is possible they could become applicable at higher TRL levels. When seeking to define what constitutes an advanced alternative fuel (AAF), a number of important sources have been referred to. Principally, the SET-Plan Integrated Roadmap description has been used as the main guide to define the fuel types considered. The roadmap states such fuels represent new technological concepts for the introduction of non-biomass and non-fossil based alternative fuels in transport. This includes: - CO2-based and CO2-neutral liquid and gaseous fuels such as methanol, ethanol, green gas or other fuel molecules using renewable energy, and - Artificial photosynthesis and fuel from photosynthetic microorganisms (in water and land environments) and from artificial photosynthesis mimics (SET-Plan Integrated Roadmap, 2014).