Shipping’s decarbonization timeline has moved from a distant policy discussion to an active, evolving set of binding requirements that directly affect fleet planning today. Here’s where the targets currently stand, and what’s genuinely changed most recently.
The Core Targets
The IMO’s revised 2023 GHG Strategy set out an ambitious, staged framework: at least a 20% reduction in total annual greenhouse gas emissions from international shipping by 2030 (striving for 30%), at least a 70% reduction by 2040 (striving for 80%), compared to 2008 levels, with the ultimate ambition of reaching net-zero emissions by or around 2050. This 2023 revision notably increased ambition compared to the IMO’s earlier 2018 strategy, which had targeted a somewhat less aggressive trajectory.
Alongside these headline targets, the IMO separately maintains a goal of reducing carbon intensity (emissions per transport work, rather than absolute emissions) by at least 40% by 2030 compared to 2008 — this carbon intensity metric is what EEXI and CII, covered in detail elsewhere on this site, are specifically designed to enforce at the individual vessel level.
The Regulatory Mechanisms Currently in Force
EEXI (Energy Efficiency Existing Ship Index). A one-time technical certification confirming a vessel meets a minimum energy efficiency baseline relative to its design, verified through an approved EEXI technical file and required for vessels to hold a valid International Energy Efficiency Certificate.
CII (Carbon Intensity Indicator). An annual, operational rating (on an A-to-E scale) reflecting a vessel’s actual carbon intensity performance based on real operational data, with required annual improvement targets that become more stringent each year — commonly reported at around a 2% annual improvement requirement through the mid-2020s, tightening further in subsequent years.
SEEMP Part III. The Ship Energy Efficiency Management Plan’s operational component, mandating a structured plan for continuous efficiency improvement and CII compliance tracking specific to each vessel.
What’s New and Actively Developing (2025-2026)
This is where the picture has moved meaningfully in the last year, and where owners need to pay closest attention:
The Net-Zero Framework (NZF). Approved in principle at MEPC 83 in April 2025, this proposed framework introduces well-to-wake greenhouse gas fuel intensity limits, a compliance credit system, and a pricing/taxation mechanism via a proposed IMO Net-Zero Fund — representing a significant expansion beyond the current EEXI/CII framework toward a more comprehensive carbon pricing approach for shipping. However, adoption of this framework was delayed at the IMO’s second extraordinary MEPC session in October 2025, with the meeting adjourned until October 2026 — meaning owners should treat the NZF as a strong likely future direction rather than a currently finalized rule, and continue monitoring developments closely through the rest of 2026.
The 2026 CII review. The IMO committed to formally reviewing the effectiveness of CII and EEXI implementation by no later than January 1, 2026, with potential tightening of rating thresholds or reduction factors for the 2027-2030 period as a likely outcome — this review has been a genuine point of industry tension, with environmental advocates arguing recent proposed adjustments remain insufficient to stay on track for the 2050 net-zero goal, while industry stakeholders have pushed back on the pace and economic impact of further tightening.
Regional carbon markets increasingly intertwined with IMO measures. The EU Emissions Trading System (ETS) now covers a substantial share of voyages into and out of Europe, with full scope expected by 2026, while FuelEU Maritime has imposed penalties on high-carbon fuels since 2025 — owners are increasingly needing to model the combined effect of IMO measures alongside these regional requirements, rather than treating them as separate compliance tracks.
What Ship Owners Should Actually Be Doing Now
- Confirm current EEXI compliance status and ensure the technical file and certification are genuinely current, not just historically completed.
- Actively manage CII rating trajectory, since the annual improvement requirement compounds — a vessel barely compliant today may fall out of compliance within a few years without proactive efficiency measures.
- Model the combined cost impact of IMO measures alongside EU ETS and FuelEU Maritime for any vessels trading into European ports, rather than assessing compliance costs in isolation.
- Monitor the October 2026 MEPC session outcome closely, given the Net-Zero Framework’s potential to introduce a genuinely new cost and compliance dimension (the credit and pricing mechanism) beyond current EEXI/CII requirements.
- Consider fleet renewal and retrofit decisions against the full decade’s likely regulatory trajectory, not just current requirements — vessels ordered or retrofitted today will need to remain compliant through a regulatory landscape that’s still actively tightening.
A Balanced Perspective
The overall direction of travel is unambiguous — shipping’s decarbonization requirements are tightening, not loosening, and the industry consensus increasingly expects the Net-Zero Framework or something similar to eventually be adopted in some form. The genuine uncertainty lies in timing and the specific mechanism’s final shape, which is precisely why the October 2026 MEPC session is being watched so closely across the industry.
IMO decarbonization requirements are actively evolving, with the Net-Zero Framework specifically still under negotiation as of mid-2026. Always confirm current requirements and monitor upcoming MEPC sessions through your classification society, flag state, or IMO’s own published updates before making long-term fleet or compliance decisions.