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From October 14 to 17, 2025, the International Maritime Organization’s (“IMO”) Marine Environment Protection Committee (“MEPC”) held an extraordinary session to consider the adoption of amendments to MARPOL Annex VI, including the proposed IMO Net Zero Framework (“NZF”). The session concluded with a decision to adjourn and reconvene in 12 months, allowing additional time to consider revisions to the NZF and for Member States to build consensus.

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In the interim, technical and implementation details are being developed and refined through IMO bodies, notably the Working Group on the Reduction of Greenhouse Gas Emissions from Ships (“Working Group”), which met from October 20 to 24, 2025, to advance NZF guidelines.

Meanwhile, the United States continues to reaffirm its strong opposition to the NZF, while outlining potential retaliatory measures. European Union decarbonization regulations remain in force, and regional frameworks continue to evolve in the absence of unified IMO action. This regulatory uncertainty highlights the importance of proactive engagement with policymakers and strategic planning across various potential compliance scenarios.

The IMO Net-Zero Framework: Scope and Ambition

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The NZF is the centerpiece of the IMO’s mid-term greenhouse gas (“GHG”) reduction measures, intended to be formalized as a new Chapter 5 of MARPOL Annex VI. Its primary objective is to achieve net-zero GHG emissions from international shipping by 2050, in line with the 2023 IMO Strategy on GHG Emissions. The NZF applies to all vessels of 5,000 gross tons and above on international voyages, with limited exceptions for vessels operating solely within national waters, non-mechanically propelled vessels, and certain offshore platforms. The draft regulations are built on two main pillars:

Technical Element: A GHG fuel standard that mandates progressive reductions in the GHG fuel intensity (“GFI”) of marine fuels, measured from production to use or on a well-to-wake (“WtW”) basis.

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Economic Element: A global GHG emissions pricing mechanism, requiring vessels that do not meet the GFI targets to purchase “Remedial Units” (“RUs”), with revenues paid into the IMO Net-Zero Fund by the shipowner.

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This dual approach is designed, in theory, to both drive the uptake of zero and near-zero (“ZNZ”) GHG fuels and technologies and create a level playing field for the global fleet.

Key Regulatory Mechanisms and Compliance Pathways

As currently drafted, each vessel would need to calculate its annual GFI of all fuels used on a WtW basis. The target GFI is structured into two tiers that vessels would need to meet: a Base Target (Tier 2) and a more stringent Direct Compliance Target (Tier 1). Both targets get progressively more stringent annually.

At the close of each reporting year, vessels would need to assess their GFI compliance. Vessels that meet or exceed the Direct Compliance Target would earn Surplus Units (“SUs”), which may be banked for up to two years, traded with other vessels, or voluntarily canceled as a climate mitigation measure. Conversely, vessels that fall short would need to offset their deficit by acquiring SUs from other vessels (pooled compliance), using previously banked SUs, or purchasing RUs from the IMO at benchmark prices. For the 2028–2030 period, RU prices were to be set at $100 per ton of CO₂eq (CO2&nbsp;equivalent) for Tier 1 and $380 per ton for Tier 2.

Recent IMO Actions and the Adjournment Decision

MEPC 83 in April 2025 endorsed the NZF text and set in motion a process for formal adoption at the October 2025 extraordinary session. While broad support was evident at MEPC 83 where the NZF advanced by simple majority, geopolitical dynamics evolved in the intervening months, including escalating U.S. opposition and explicit threats of reciprocal measures targeted at NZF‑supporting countries.&nbsp;

Notably, on August 12, 2025, the Secretaries of State, Energy, and Transportation issued&nbsp;Joint Statement on Protecting American Consumers and Shipping Industries by Defeating the International Maritime Organization’s “Net-Zero Framework” aka Global Carbon Tax.&nbsp;The Trump Administration made it clear that it unequivocally rejected the proposal; stated it would not tolerate any action that increases costs for U.S. citizens, shipping and energy companies, and their customers; and threatened retaliation against those in support. More notably, on October 10, 2025, days before the MEPC extraordinary session, the Secretaries of State, Energy, and Transportation issued another joint statement,&nbsp;Taking Action to Defend America from the UN’s First Global Carbon Tax – the International Maritime Organization’s (IMO) “Net-Zero Framework” (NZF), and stated that the “Administration unequivocally rejects this proposal before the IMO” and encouraged other nations “to join in rejecting adoption of the NZF.” The United States again threatened retaliation for any Member States that support the proposal, which included blocking their vessels from U.S. ports, visa restrictions, additional port fees, and sanctions, among others.&nbsp;

The decision to adjourn stemmed from a consensus that the NZF, as written, contained uncertainties and concerns regarding the types of fuels that would be used to reach net-zero emissions, fuel availability, the infrastructure for new fuels, and port modernization required to achieve this goal. Additionally, the decision made clear that clarification and more detail were needed to understand how the funds collected under the NZF would be disbursed and how the credits would operate.&nbsp;

Against that backdrop, the MEPC agreed to adjourn the extraordinary session and reconvene in 12 months, while committing to continued work on NZF implementation guidelines and further consensus building among Member States.&nbsp;

The MEPC’s decision to adjourn and reconvene in 12 months preserves the path toward a unified global maritime decarbonization framework, while acknowledging the geopolitical and technical complexities at play. With implementation work advancing at the Working Group and Member States engaging in intensive negotiations, the outcome will shape the trajectory of the maritime sector’s climate transition, the coherence of global regulatory architecture, and the competitive landscape for shipping and its supply chain. In the meantime, the persistence of regional regimes and the prospect of trade-linked responses underscore the need for careful strategic planning and sustained engagement across policy, operational, and investment horizons.

United States’ Position and Escalating Opposition

U.S. opposition has been sustained and unequivocal during the Trump Administration and is unlikely to change in the coming years if the “Economic Element” remains in place. The U.S. delegation withdrew from MEPC 83 on April 9, 2025, and urged other governments to reconsider support for the NZF. In the August 2025 joint statement, the United States reiterated its view that the NZF is effectively a global carbon tax imposed by an unaccountable United Nations body, disadvantaging American consumers and supply chains while favoring competitors. As noted previously, on the eve of the October extraordinary session, a further U.S. joint policy statement enumerated potential punitive actions against countries that voted to adopt the NZF. These punitive measures included targeted investigations and regulatory actions to address anti‑competitive practices; restrictions on port access for certain flagged vessels; tightened visa rules and fees for maritime crews; port fees on vessels owned, operated, or flagged by NZF‑supporting nations; and sanctions on officials advocating climate policies perceived to burden U.S. consumers.&nbsp;

This escalation coincided with amendments from the Office of the U.S. Trade Representative (“USTR”) to its Section 310 action addressing China’s maritime, logistics, and shipbuilding sectors, highlighting the administration’s broader strategy of leveraging the maritime domain to advance international and domestic policy objectives. We note, though, that this USTR action was also delayed by one year.&nbsp;

Voting Dynamics and Member State Positions

The April 2025 preliminary approval saw about 63 countries in favor, 16 opposed, and 24 abstentions. The opposing bloc included the United States, Saudi Arabia on behalf of Bahrain, Iran, Iraq, Jordan, Kuwait, Lebanon, Malaysia, Oman, Pakistan, Qatar, the Russian Federation, Thailand, the United Arab Emirates, Venezuela, and Yemen.&nbsp;

The approving group included the European Union, China, Japan, Brazil, and India, with expectations that Canada, the United Kingdom, South Korea, Singapore, Chile, and others would align in favor ahead of final adoption.&nbsp;

Unlike preliminary approval, final adoption requires a two‑thirds majority, making alignment among major flag States determinative. The United States’ October ultimatum may further shape coalition cohesion as Member States weigh potential costs and trade implications against the benefits of a unified global decarbonization regime.

IMO adoption of the NZF would have triggered reviews and possible adjustments to European Union measures governing maritime GHGs, including the Emissions Trading System and FuelEU Maritime regulation. With the NZF deferred, those regimes remain unchanged, and the industry continues to navigate a fragmented landscape of regional and national rules related to GHG emissions and marine fuels. This divergence complicates compliance planning, investment decisions, and supply chain operations across global routes.&nbsp;

In the coming months, industry stakeholders including shipowners, charterers, fuel suppliers, shipbuilders, ports, and financial institutions, face continued uncertainty and should prepare for multiple scenarios. These include the potential of a single framework, whether it be the NZF as currently drafted or with significant amendments, or a patchwork of regional efforts if the NZF is ultimately not approved.

The Working Group’s ongoing work is poised to refine critical elements of the NZF’s implementation guidance, including lifecycle assessment methodologies, fuel certification protocols, data verification processes, and the design of reward and pricing mechanisms.&nbsp;

Simultaneously, U.S. efforts to shape the negotiations through trade, port, visa, and sanctions policy will inevitably influence consensus building. Stakeholders should remain engaged with IMO and Member State deliberations while tracking developments across regional regimes, particularly in the EU.&nbsp;

For companies beyond the shipping industry, the U.S. approach to the NZF reflects a broader pattern of leveraging international environmental issues to advance domestic industrial priorities and inform bilateral trade dynamics.&nbsp;

The MEPC’s decision to adjourn and reconvene in 12 months preserves the path toward a unified global maritime decarbonization framework, while acknowledging the geopolitical and technical complexities at play. With implementation work advancing at the Working Group and Member States engaged in intensive negotiations, the outcome will affect the trajectory of the maritime sector’s climate transition, the coherence of global regulatory architecture, and the competitive landscape for shipping and its supply chain. In the meantime, the persistence of regional regimes and the prospect of trade‑linked responses underscore the need for careful strategic planning and sustained engagement across policy, operational, and investment horizons.&nbsp;

This article is one in a series of articles written for Blank Rome’s&nbsp;<a href="https://www.blankrome.com/publications/mainbrace-january-2026">MAINBRACE: January 2026</a>&nbsp;edition.

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This article was first published in&nbsp;Law360&nbsp;on November 24, 2025.

Reprinted with permission from Lexis Nexis © 2025, Portfolio Media, Inc. All rights reserved. Further duplication without permission is prohibited, contact&nbsp;<a href="mailto:reprints@law360.com">reprints@law360.com</a>.

IMO Net Zero Shipping Framework: Extraordinary IMO Session Adjourned; Work Continues

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IMO Net Zero Shipping Framework: Extraordinary IMO Session Adjourned; Work Continues

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