Members of the International Maritime Organization (IMO) have voted to postpone approving a plan to curb shipping emissions, after United States President Donald Trump threatened to impose sanctions on countries that supported the measure.

The vote on Friday set back plans to regulate the shipping industry’s contributions to climate change by at least 12 months, even though the Net Zero Framework (NZF) had already been approved by members of the London-based IMO, a United Nations body, in April.

The decision to formally delay adopting the framework until late next year came a day after President Trump took to his Truth Social platform, saying: “I am outraged that the International Maritime Organization is voting in London this week to pass a global Carbon Tax.”

“The United States will NOT stand for this Global Green New Scam Tax on Shipping,” he said, telling countries to vote against the plan.

Washington also threatened to impose sanctions, visa restrictions and port levies on countries that supported the deal.

In advance of this week’s meeting in London, about 63 IMO members who had voted for the plan in April were expected to maintain their support for curbs on emissions, and others were expected to join the initiative to formally approve the framework.

Following Trump’s social media threat, delegates in London instead voted on a hastily arranged resolution to push back proceedings on the matter, which passed by 57 votes to 49.

The IMO, which comprises 176 member countries, is responsible for regulating the safety and security of international shipping and preventing pollution on the high seas.

Since returning to power in January, Trump has focused on reversing Washington’s course on climate change, encouraging fossil fuel use by deregulation, cutting funding for clean energy projects and promising businesses to “drill, baby drill”.

‘A missed opportunity’

A spokesman for UN chief Antonio Guterres called Friday’s decisions “a missed opportunity for member states to place the shipping sector on a clear, credible path towards net zero emissions”.

The International Chamber of Shipping, representing more than 80 percent of the world’s fleet, also expressed disappointment.

“Industry needs clarity to be able to make the investments needed to decarbonise the maritime sector,” the chamber’s Secretary-General Thomas Kazakos said in a statement.

Disappointed, but still very much Committed! https://t.co/7P192kAvCx

— Thomas A. Kazakos (@ThomasKazakos) October 17, 2025

Ralph Regenvanu, the minister for climate change for Vanuatu, said the decision to delay the vote by 12 months was “unacceptable given the urgency we face in light of accelerating climate change”.

“But we know that we have international law on our side and will continue to fight for our people and the planet,” Regenvanu added.

Leading up to Friday’s decision, China, the European Union, Brazil, Britain and several other members of the IMO had reaffirmed their support.

Countries that opposed the measures included Russia and Saudi Arabia.

A Russian delegate described the proceedings as “chaos” as he addressed the plenary on Friday after talks had lasted into the early hours.

Argentina and Singapore, two countries that had previously voted in support of the framework in April, were among those that voted to postpone introducing it this week.

If it had been formally adopted this week, the Net Zero Framework (NZF) would have been the first global carbon-pricing system, charging ships a penalty of $380 per metric tonne on every extra tonne of CO2-equivalent they emit while rewarding vessels that reduce their emissions by using alternatives.

The framework plan is intended to help the IMO reach its target of cutting net emissions from international shipping by 20 percent by 2030 and eliminating them by 2050.

Climate change is already beginning to affect shipping and the safety of seafarers, including by changing ocean currents and causing more frequent and severe storms.

Proposals to reduce reliance on dirtier bunker fuel in the shipping industry include using ammonia and methanol, as well as fitting cargo ships with special sails.