Governments agree green shipping targets and fees for missing them

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Governments at the International Maritime Organization (IMO) have agreed on a set of annual emissions reduction targets for 2028 to 2035 along with financial penalties for failing to meet them.

After a week of talks in London, they voted through a decision that ship owners should reduce the emissions intensity of their vessels – the amount of climate-heating emissions per unit of fuel – by 30% by 2035 and 65% by 2040, both against 2008 levels.

In a closing session on Friday, they also fixed annual targets for each year between 2028 and 2035, but will decide on targets for the 2035-2040 period in 2032. Governments agreed in 2023 to reach net zero “by or around i.e. close to 2050”.

Ship owners who fail to meet the “base” targets on the path to achieving a 30% reduction by 2035 will have to buy “remedial units” from the IMO to make up the difference, priced at $380 a tonne of carbon dioxide equivalent.

The IMO will spend the money through a new “Net Zero Fund” on cleaning up the maritime sector, helping workers through the green transition and compensating for any negative impacts of that transition on developing economies, such as increases in the price of food due to higher shipping costs.

No money raised from selling remedial units will be spent outside the maritime sector, disappointing climate activists and some governments which had hoped the money could generate tens of billions of dollars per year in broader climate finance.

On top of these base targets, governments have set additional compliance targets which are harder to meet and would deliver a more ambitious reduction in emissions intensity of 43% by 2035.

If shipowners fail to meet these additional goals, they can make up for it through three options: buying cheaper second-tier remedial units at $100 a tonne; buying “surplus units” from ships that have met the goals; or using surplus units they have banked by over-achieving in previous years.

table visualization

Governments have also agreed on a threshold for how polluting a shipping fuel can be and still be officially considered a “zero or near zero fuel”, making its use eligible for funding from the Net Zero Fund.

That threshold has been set at 19 grammes of carbon dioxide equivalent per megajoule (gCO2e/MJ) of energy, falling to a maximum of 14 grammes in 2035. This sets up battles between industry and environmental lobbyists over the carbon intensity of different fuels, such as liquefied natural gas (LNG) and various types of biofuel.

The Society for Gas as a Marine Fuel, an industry group, argued in a paper submitted to the IMO that LNG has a carbon intensity of 17.4 gCO2e/MJ, whereas two others – Pacific Environment and the International Council on Clean Transportation – argue it is either 23.78 gCo2e/MJ or 27.95 gCo2e/MJ. Those higher measurements would make LNG ineligible for Net Zero Fund support.

China and India defeat attempt to reveal how much each ship pollutes

One nation that was not active at the talks was the United States, which has largely withdrawn from international environmental and climate processes under President Donald Trump, who supports the use of more fossil fuels.

Shipping news service Tradewinds reported that the US left the IMO talks on Tuesday night and threatened, in a letter sent to London-based embassies, “reciprocal measures so as to offset any fees charged to US ships” – although it is unclear what that might mean in practice.

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