The US has warned countries they could face tariffs, visa restrictions, and port levies if they support the International Maritime Organisation’s (IMO) Net Zero Framework, Reuters reports citing sources.
The framework, approved in principle at IMO in April and due for a final vote in October, would introduce the first global carbon levy on shipping.
The measure targets vessels over 5,000 gross tons, covering about 85% of the sector’s emissions, with revenues earmarked for clean fuel investment and climate support for vulnerable states.
Washington formally rejected the plan last month, calling it a “global carbon tax on Americans” that would raise costs for consumers and advantage rivals such as China.
A U.S. State Department spokesperson told Reuters the administration was “actively exploring remedies including tariffs, visa restrictions, and/or port levies should this effort succeed.”
The Netherlands confirmed receiving such a warning, though it remains unclear how many other countries have been contacted.
Analysts warn U.S. pressure could derail the October vote, threatening momentum on one of the shipping industry’s most significant climate initiatives.
