Consider this: Since 2007, Maersk has cut its emissions by 39% per container even as cargo grew by 27%. That’s had a substantial impact on the environment—the Danish shipping giant is king of a global industry that releases about the same amount of carbon as the entire nation of Indonesia each year—but it has also been a financial boon. Maersk saves more than $100 million in fuel each year by slowing its ship speeds, closely monitoring their paths, and sending out to sea the Maersk Triple E, the most energy-efficient container ships in the industry.