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The shipping industry accounts for more greenhouse gas emissions than airplanes, buses or trains. Yet it was not included in last year's Paris accord--and an attempt last month to redress this failure manages to be both unambitious and impractical.

The world's 90,000 shipping vessels burn about five million barrels of petroleum products each day, and their emissions are expected to increase as much as five-fold by 2050. In part because it's not clear which countries should be accountable for the emissions of any particular ship, the industry has not been part of any recent international climate agreements.

So a United Nations agency recently proposed a deal: Countries could promise to aim to agree on a strategy for cutting carbon emissions from shipping--by 2023. No word about when emissions might actually start falling. Or how much. Or how. It is an agreement to seek an agreement.

That lethargic pace ignores the easy and relatively inexpensive steps that ship operators could take right away to reduce their emissions. Simply polishing a ship's propellers, for example, which makes ships run more efficiently, can reduce emissions by as much as 8 percent.

Ultimately, the most efficient way to cut global emissions is for countries to adopt a carbon tax, equal to the cost of the environmental damage done by each ton emitted. Putting a price on carbon can be a complex undertaking, but it is by no means impossible. And a sensible carbon tax would give companies in every part of the economy, including shipping, an incentive to seek the most affordable changes to how they operate.

Editorial on 11/09/2016

Print Headline: As for the ships?

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