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The Laura Maersk, launched in September, is the first cargo ship to set sail with a green methanol engine.
It's a significant milestone in the industry’s efforts to lower its global greenhouse gas emissions, which currently stand at 3 percent of the world's total emissions - roughly as much as the aviation industry.
So what is the the potential for green shipping, and what are the limitations?
Ana Swanson writes about trade and international economics for the New York Times.
