The Trump Administration blocked the UN’s global tax on cargo ship pollution, derailing a key step toward decarbonizing the maritime sector and delaying global climate action.
U.S. threats derail vote on global emissions levy
The United States has once again succeeded in derailing the global tax on cargo ship pollution. The Trump Administration’s strategy, marked by intimidation and threats of retaliation, proved effective. After sinking the global plastics treaty, Washington also blocked the UN vote on maritime emissions.
The decisive meeting took place last week at the International Maritime Organization (IMO), the UN agency that counts 176 member countries. Delegates were expected to vote on adopting a global carbon tariff for the shipping industry. However, following multiple threats from the U.S. government, including visa restrictions, port taxes, and potential sanctions, member states meeting in London agreed to suspend the vote. For weeks, the State Department had warned several IMO members not to approve the Net-Zero Framework.
What the Net-Zero Framework proposed for cargo ship pollution
The regulation would have required cargo ships to cut greenhouse gas emissions below a set threshold or face a global tax. In April 2025, the IMO had reached a preliminary deal on a package of measures to curb emissions from the most polluting vessels. The framework established binding, worldwide limits on ship emissions and introduced a carbon pricing mechanism for greenhouse gases from maritime transport.
The proposal targeted ships over 5,000 gross tons and included incentives for operators to adopt cleaner fuels. Technically, the new requirements were set to take effect in 2027, while the tax itself would begin in 2029.
The end of shipping’s green transition?
The IMO’s environmental committee meeting last week was heavily influenced by the U.S. government. “The United States is using a broad range of economic and diplomatic tools to discourage other nations from pursuing the green transition. The project seems entirely dead, not merely delayed,” analysts Trevor Sutton and Evelyne Williams from Columbia University’s energy think tank told Axios.
The deal is effectively dead, at least as long as Trump remains in the White House. Still, Williams believes a revival could come from a multilateral initiative among key global players.
The missed vote may not spell the end of efforts to decarbonize shipping. The analyst noted the impact of existing EU regulations, industry investments in sustainable fuels, and the growing adoption of dual-fuel ships capable of running on alternative energy sources. What remains to be seen is whether the initiative will continue on a global scale or only through regional frameworks.
A more polluted and dangerous world for people and oceans
The nonprofit Ocean Conservancy condemned the outcome: “The IMO’s failure to reach an agreement marks a serious setback for people and the planet. It is shameful that climate action was delayed when we see its devastating effects every day, and when marine fuels have been linked to 250,000 premature deaths and 6 million cases of childhood asthma each year.”
“Although imperfect, the deal would have required ships worldwide to significantly cut greenhouse gas emissions, accelerating the shift from dirty fossil fuels to zero-emission alternatives like wind-powered ocean crossings and renewable-based synthetic fuels. It would have drastically reduced carbon emissions and saved lives. A world without this agreement is a world more polluted and dangerous for people, wildlife, and the ocean.”
