Greenhouse gas emissions from three ship types - containerships, bulkers and tankers - could be reduced by a third, on average, by reducing their speed.  The cumulative savings from reducing the speed of these ships alone could, by 2030, be as much as 12% of shipping’s total remaining carbon budget if the world is to stay under the 1.5ºC global temperature rise, the CE Delft study found. 

Study shipping 2017 10 18

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