By SOMINI SENGUPTA NYTimes News Service
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Amid the turmoil over global trade, countries around the world reached a remarkable, though modest, agreement Friday to reduce the climate pollution that comes from shipping those goods worldwide — with what is essentially a tax, no less.

An accord reached in London under the auspices of the International Maritime Organization, a United Nations agency, would require every ship that ferries goods across the oceans to lower its greenhouse gas emissions or pay a fee.

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The targets fall short of what many had hoped. Still, it’s the first time a global industry would face a price on its climate pollution no matter where in the world it operates. The proceeds would be used mainly to help the industry move to cleaner fuels. Some of the money could also go to developing countries most vulnerable to climate hazards. The accord would come into effect in 2028, pending approval by country representatives at the agency’s next meeting in October.

Given the widespread support for Friday’s terms, the head of the organization expressed hope it would be adopted in October with few or no changes.

The agreement marks a rare bit of international cooperation that’s all the more remarkable because it was reached even after the United States pulled out of the talks earlier in the week. No other countries followed suit.

“The U.S. is just one country, and that one country cannot derail this entire process,” said Faig Abbasov, shipping director for Transport and Environment, a European advocacy group that has pushed to clean up the maritime industry. The agreement is the “first binding decision that will force shipping companies to decarbonize and switch to alternative fuels.”

The agreement applies to all ships, no matter whose flag they fly, including ships registered in the United States, although the vast majority of ships are flagged in other countries. It remained unclear whether or how Washington might respond to the fee agreement.

A State Department official said only that the U.S. didn’t participate in the negotiations.

Ships mostly run on heavy fuel oil, sometimes called bunker fuel, and more than 80% of global goods move by ships. The industry accounts for around 3% of global greenhouse emissions, comparable to the emissions from aviation.

The agreement reached Friday is far less ambitious than one initially proposed by a group of island nations that had suggested a universal assessment on emissions.

After two years of negotiations, the proposal sets out a complicated two-tiered system of fees. It sets carbon intensity targets, which are like clean fuel standards for cars and trucks. Ships using conventional shipping oil would have to pay a higher fee ($380 per metric ton of carbon dioxide equivalent produced) while ships that use a less carbon-intensive fuel mix would have to pay a lower fee ($100 for every metric ton that exceeds the fuel standard threshold).

It is expected to raise $11 billion to $13 billion a year, according to the organization’s estimates.

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