The eighty-second meeting of the Marine Environment Protection Committee (MEPC82) is currently evaluating the effectiveness of the International Maritime Organization’s (IMO) Carbon Intensity Indicator (CII) in assessing greenhouse gas (GHG) performance across various ship types. While acknowledging the benefits of the CII, the International Association of Ports and Harbors (IAPH) has identified industry concerns regarding its limitations. In response, the IAPH is developing its own GHG performance indicator, which will be integrated into an expanded and revised IAPH Environmental Ship Index (ESI). This new system is slated for full operational status by 2026. The IAPH's indicator will adopt a Well-to-Wake (WtW) approach, concentrating on the carbon intensity of bunkered fuels rather than the distance sailed. This methodology is designed to better accommodate diverse operational realities, such as extended berthing times, which can currently skew CII results. It aims for applicability across all ship types and sizes, including vessels under 5,000 gross tonnes. The revised ESI will leverage fuel carbon intensity data sourced from Bunker Delivery Notes or IMO defaults, and will incorporate the global warming potential of different fuels. The IAPH intends to update the ESI annually, with verification conducted by classification societies. These enhancements are intended to more effectively evaluate and encourage innovations in carbon reduction technologies on board ships, including systems like carbon capture, wind assistance, batteries, and air lubrication. A separate innovation module is also planned.