St. John’s Antigua – The United States has abruptly withdrawn from ongoing climate negotiations at the International Maritime Organization (IMO), signaling a sharp rejection of new measures aimed at reducing greenhouse gas emissions from global shipping.

During the 83rd session of the IMO’s Marine Environment Protection Committee (MEPC 83) this week in London, U.S. delegates were reportedly instructed by Washington to leave the meeting altogether, halting their involvement in talks that have been years in the making. The directive was issued directly to the U.S. delegation participating in the IMO talks, with instructions to cease all engagement.

The IMO, a specialized agency of the United Nations comprising 175 member states, is responsible for regulating the global shipping industry. Its mandate includes developing strategies to address climate pollution from maritime transport, which contributes nearly 3% of the world’s greenhouse gas emissions.

This week’s meeting is pivotal, as countries are set to make decisions that could determine whether the industry accelerates its shift away from fossil fuels or remains locked into a high-emission trajectory.

According to a strongly worded diplomatic note circulated to IMO Member States, the Trump Administration declared its firm opposition to the organization’s proposed goal of achieving net-zero emissions in international shipping by 2050. The U.S. described such targets as “hypothetical,” “expensive,” and based on “unproven fuels,” warning that they would “unwisely burden” American industries and “drive inflation globally.”

“President Trump promised the American people a return to energy dominance,” the memo stated, accusing the IMO of pursuing an unfair agenda similar to the Paris Agreement, which the administration withdrew from in 2020.

The U.S. went further, suggesting that the proposed emissions measures were a covert attempt at wealth redistribution and warned that any fees imposed on U.S. ships would trigger retaliatory economic action. “The U.S. rejects any and all efforts to impose economic measures against its ships based on GHG emissions or fuel choice,” the missive stated.

The U.S. stance threatens to deepen divides within the IMO, where developing countries have called for equity in transition measures, while wealthier nations push for faster decarbonization timelines. By rejecting any differentiation between countries and opposing climate-linked shipping fees, the U.S. risks stalling one of the few global mechanisms for regulating shipping emissions.

Environmental advocates warn that without firm international rules, shipping emissions will continue to rise, pushing the world further off course from limiting warming to 1.5°C.