ZESTAs’ paper discusses findings from the MARIN NL Model for ESSF SAPS, which compares various marine fuels’ greenhouse gas emissions over a 100-year Global Warming Potential (GWP), noting that some fuels produce 0% emissions over this period. Only technologies reaching at least demonstration stage (TRL7 or higher) are considered. Additionally, references are made to Technology Readiness Levels (TRLs) and Commercial Readiness Levels (CRLs) following expanded definitions presented to ISWG-GHG 14 by IMO Secretariat, DNV, and Ricardo plc on 22nd March 2023.