Shipping to halve carbon footprint by 2050 under first sector-wide climate strategy

Countries adopted a compromise emissions target for shipping at the International Maritime Organization on Friday, with further battles to come over how to put it into practice

Global shipping must at least halve its emissions by 2050, under a hard-fought international deal that for the first time sets the sector on course to shrink its carbon footprint.

The agreement reached by the International Maritime Organization (IMO) on Friday is an initial step for one of the world’s biggest polluting industries. Over the next five years, negotiators are to develop a package of measures to fulfil the target, delivering a final strategy in 2023.

After a tense week of talks, with blocs of countries tussling over the level of ambition, negotiators stuck to a compromise forged the previous week.

Climate advocates expressed disappointment the target did not go further, saying full decarbonisation by 2050 was needed to align with the global warming limits in the Paris Agreement.

“Nevertheless, this deal provides the very clear policy signal that is needed for international shipping to begin to play its full part to achieve the goals of the Paris Agreement,” Marshall Islands environment minister David Paul and Christiana Figueres, head of the Mission 2020 initiative on climate action, said in a joint statement Thursday evening. It “keeps alive” the possibility to meet the accord’s stretch 1.5C warming limit and to review the strategy in light of new science, they added.

Now the task is to decide how to meet those climate goals for shipping.

The initial strategy

The goal is to reduce maritime emissions at least 50% by 2050, from 2008 levels, while pursuing full decarbonisation in line with the Paris Agreement. The strategy also sets a target to reduce CO2 emissions relative to each tonne of cargo shipped by at least 40% by 2030 and pursue efforts towards 70% by 2050, and plans to review the IMO’s energy efficiency design rules with an eye to strengthening them.

Talks on implementing the targets are to be guided two principles: “common but differentiated responsibility” between rich and poor countries for tackling climate change, from the UN climate convention; and the IMO rule against discrimination between ships by the country where their flags are registered.

In a sign of battles to come, several countries registered concerns about the compromise. The US, Saudi Arabia, Brazil, India, Iran and the Philippines were among the strongest opponents of a cap on emissions – some arguing it’s premature and could harm the shipping industry, and others saying it would need adjustment before the strategy is finalised in 2023.

Another key battleground is how to divide responsibility between the world’s rich and poor, while respecting the IMO’s policy against discrimination between its 173 member countries. Russia, Canada and the US were among those warning this could be tricky.

The principle of “common but differentiated responsibilities”, or CBDR, is a familiar battle line in international climate change negotiations. Developing countries argue the industrialised world should shoulder more work; developed countries including the US and Europeans say everyone needs to do as much as possible.

But drawing those divisions is complicated in the shipping sector, which largely operates – and emits – outside national boundaries.

“When it comes to the IMO, CBDR is very difficult to apply, frankly,” Figueres, former head of UN Climate Change, told journalists outside the IMO last Friday. It is not clear which country is responsible for a ship’s emissions: where the shipowner is based, where its flag is registered, where its cargo comes from or where it is going.

Figueres argued the principle should not become a “straightjacket” or let emerging economies off the hook. “Developed countries have a historic responsibility for their emissions. That is not disputed,” she said. “The Paris Agreement also looks into the future… in the future there is shared responsibility.”

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