U.S. Marine Corps photo by /Released 110928-F-ZZ999-007.JPG
Oct 4, 2011
Exhaust boilers at Thule Air Base, Greenland, take the excess heat from the electrical generators and use it to heat the base. In fiscal 2012, the new boilers saved officials more than $2.2 million and close to 800,000 gallons of fuel. (Courtesy photo)
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