IMO's Net-Zero Shipping Framework Survives US Delay Tactics, Talks Moved to Autumn

Introduction

The International Maritime Organization (IMO) recently concluded a pivotal round of negotiations on its Net-Zero Framework (NZF), a comprehensive set of measures designed to decarbonize the global shipping industry. Despite intense pressure and procedural obstruction from the United States, the framework remains intact, though final decisions have been postponed until the autumn. The outcome underscores both the deep divisions among member states and the enduring political will to curb maritime emissions.

The IMO's Net-Zero Framework: A Key Step for Shipping Decarbonization

The NZF is the IMO’s most ambitious attempt to align international shipping—responsible for nearly 3% of global greenhouse gas emissions—with the Paris Agreement goals. It includes a mix of carbon pricing mechanisms, mandatory fuel efficiency standards, and a global fuel standard that would progressively reduce the carbon intensity of shipping fuels. The framework also envisions a levy on emissions, with revenues channeled to support clean technology adoption, especially in developing nations.

Negotiators had hoped to finalize the NZF during this session, building on the IMO’s initial strategy from 2018, which called for a 50% reduction in emissions by 2050 compared to 2008 levels. However, the current proposal aims for net-zero emissions by or around 2050, with interim targets for 2030 and 2040—a significant acceleration that has drawn both praise and criticism.

US Opposition and Delay Tactics

Throughout the week-long talks, the United States, along with a small group of allies, employed a series of procedural maneuvers to slow progress. These included raising objections to the agenda, demanding additional impact assessments, and calling for amendments that would effectively weaken the framework's scope. Behind the scenes, US delegates argued that the NZF’s carbon pricing measures would disproportionately burden American trade and shipping companies, and that a more technology-neutral approach was preferable.

Critics note that the US stance appeared contradictory: while the Biden administration has championed ambitious climate action domestically, its position at the IMO leaned heavily toward preserving flexibility for the fossil fuel industry. Environmental groups accused the US of acting as a spoiler, echoing similar tactics used by fossil-fuel-dependent states in other UN climate forums. Yet the majority of IMO member states—including the European Union, Pacific island nations, and many developing countries—stood firm, refusing to let the US derail the process.

“Despite a week of pressure and delay tactics from the United States, the Net Zero Framework remains intact,” stated one delegate who spoke on condition of anonymity. “The appetite for green measures is undeniable.”

Negotiations Postponed but Not Defeated

In the end, the IMO agreed to postpone the final adoption of the NZF until its next meeting, scheduled for autumn 2025. This decision was framed as a pragmatic move to allow more consultation, particularly on contentious issues like the carbon levy. However, supporters of the framework see it as a tactical victory: the postponement does not signal abandonment, but rather a strategic pause to build broader consensus.

Key parts of the framework—such as the mandatory fuel intensity standards and the levy mechanism—have already garnered tentative support from major shipping nations and industry bodies. The International Chamber of Shipping (ICS) has expressed cautious optimism, noting that a phased approach is necessary to avoid disrupting global supply chains. “We need clear rules, but they must be achievable,” said ICS’s secretary-general.

Meanwhile, environmental advocates are urging member states to use the intervening months to pressure the US to change its position. They argue that without the world’s largest economy on board, the NZF could face implementation challenges, but that the framework’s survival demonstrates that momentum for decarbonization is not easily broken.

What's Next? The Autumn Session and Future Outlook

The autumn session will be critical. Negotiators will need to resolve remaining disagreements over the carbon levy’s rate, the timeline for fuel standard compliance, and how to support developing countries’ transitions. The US is expected to continue pushing for softer targets, but it may face increasing isolation as other nations move ahead with bilateral or regional decarbonization initiatives.

• Timeline: Final decision on NZF expected by November 2025.
• Key issues: Carbon price rate, penalty for non-compliance, technology clauses.
• Industry push: Shipping companies are already investing in alternative fuels like green ammonia and methanol, signaling market readiness.

Beyond the NZF, the IMO is also working on a MARPOL Annex VI amendment to regulate black carbon and other pollutants, which could further shape the regulatory landscape. While the US delay tactics were frustrating for many, the ultimate result—keeping the NZF alive—is a testament to the coalition of countries that refuse to let the shipping industry off the hook.

As one delegate concluded: “This is not the end, nor even the beginning of the end. But it is perhaps the end of the beginning. The framework is still on the table, and the conversation is moving forward.” For the world’s 50,000 merchant ships and the climate they impact, that is a step worth taking.