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In page Environmental impact of shipping:
"Although maritime transport is the most energy-efficient method to move a given mass of cargo a given distance, the sheer size of the industry means that it has a significant effect on the environment.[4] The annual increasing amount of shipping overwhelms gains in efficiency, such as from slow-steaming. The growth in tonne-kilometers of sea shipment has averaged 4 percent yearly since the 1990s,[5] and it has grown by a factor of 5 since the 1970s.[citation needed]
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