Published by Todd Bush on April 11, 2025
Tugboats assist a container ship as it prepares to dock at the Manila International Container Terminal on April 8, 2025. (Aaron Favila / AP Photo)
Many of the world’s largest shipping nations decided on Friday to impose a minimum fee of US$100 for every tonne of greenhouse gases emitted by ships above certain thresholds, in what is effectively the first global tax on greenhouse gas emissions.
The revenue, estimated at around US$10 billion annually, will go into the International Maritime Organization’s net zero fund to invest in fuels and technologies needed to transition to green shipping. The thresholds set through the agreement will get stricter over time to try to reach the IMO’s goal of net zero across the industry by about 2050.
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The agreement, reached with the United States notably absent, takes effect in 2027. The IMO, which regulates international shipping, also set a marine fuel standard to phase in cleaner fuels.
Shipping emissions have grown over the last decade to about three per cent of the global total as vessels have gotten bigger, delivering more cargo per trip and using immense amounts of fuel.
IMO Secretary-General Arsenio Dominguez said the group forged a meaningful consensus in the face of complex challenges to combat climate change and modernize shipping.
Some environmentalists at the meeting called the agreement a “historic decision” that doesn’t go far enough. The fee doesn’t drive enough emission reductions and it won’t raise enough revenue to help developing countries transition to greener shipping, said Emma Fenton, senior director for climate diplomacy at Opportunity Green.
Fenton said the measure actually opens the door for a scenario where ships can pay to pollute instead of decarbonize, because it could be cheaper to simply absorb the fee than to make changes to reduce emissions, like switching fuels.
“The IMO has made an historic decision, yet ultimately one that fails climate-vulnerable countries and falls short of both the ambition the climate crisis demands and that member states committed to just two years ago,” they said.
Other groups welcomed the agreement as a step in the right direction.
“By approving a global fuel standard and greenhouse gas pricing mechanism, the International Maritime Organization took a crucial step to reduce climate impacts from shipping. Member states must now deliver on strengthening the fuel standard over time to more effectively incentivize the sector’s adoption of zero and near-zero fuels, and to ensure a just and equitable energy transition,” said Natacha Stamatiou of the Environmental Defense Fund.
The previous day, delegates approved a proposal to designate an emissions control area in the North-East Atlantic Ocean. Ships traveling through the area will have to abide by more stringent controls on fuels and their engines to reduce pollution. It will cover ships coming into and leaving ports in the North Atlantic, such as the United Kingdom, Greenland, France and the Faroe Islands. It will oblige ships from North America, Asia and many other destinations to reduce emissions, said Sian Prior, lead adviser to the Clean Arctic Alliance.
The Marine Environment Protection Committee, which is part of the IMO, has been in meetings all week in London and finalized its decision Friday.
One major issue during the meetings was the way the fee would be charged. More than 60 countries entered the negotiations pushing for a simple tax charged per metric ton of emissions. They were led by Pacific island nations, whose very existence is threatened by climate change.
Other countries with sizable maritime fleets — notably China, Brazil, Saudi Arabia and South Africa — wanted a credit trading model instead of a fixed levy. Finally, a compromise between the two models was reached. The compromise is in the ambition of the measure, since the fee is not a universal levy on all emissions.
Brazil’s negotiator, who wasn’t identified by name in a livestream of the closing, said the agreement isn’t intended to be perfect because each nation would have a different answer on what would be perfect. But he said nations listened to each other and came up with a framework to address climate change in an extremely challenging geopolitical environment.
The United States didn’t participate in the negotiations in London and urged other governments to oppose the emission measures being considered. The Trump administration said it would reject any efforts to impose economic measures against its ships based on emissions or fuel choice, which it said would burden the sector and drive inflation. It threatened possible reciprocal measures if any fees are charged.
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