This report assesses low-carbon marine fuel technologies in terms of their technical, economic, and carbon intensity aspects, aligning with the International Maritime Organization (IMO)’s goals of reducing GHG emissions in the global maritime industry by at least 50 percent from 2008 levels by 2050 and achieving zero-emissions by 2100.  Key technologies covered at the cost of production level include Renewable Diesel, Fatty Acid Methyl Esters (FAME), Renewable Natural Gas (RNG), MSW-based bio-methanol, e-methanol, green ammonia and green hydrogen.   This report also presents a comparative analysis of the overall carbon intensity, considering scope 1, scope 2, upstream scope 3 and downstream scope 3 (fuel combustion) emissions across these fuel pathways.