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A US Navy ship has operated on a 100 percent drop-in renewable diesel fuel - a first, according to the biofuel makers Applied Research Associates and Chevron Lummus Global.

The Naval Air Station (NAS) Oceana deep energy retrofit is a four-phase endeavor that is unprecedented in both size and scope. The project - which kicked off in 2002 and is expected to be completed in 2017 - is projected to reduce energy use by over 40 percent across more than 100 retrofitted buildings, saving the naval base over $6 million in annual energy costs.

The Department of Defense is clear-eyed about the challenges climate change poses. "The pressures caused by climate change will influence resource competition while placing additional burdens on economies, societies, and governance institutions around the world," the most recent Quadrennial Defense Review, issued in 2014, states. "These effects are threat multipliers that will aggravate stressors abroad such as poverty, environmental degradation, political instability, and social tensions-conditions that can enable terrorist activity and other forms of violence."

Despite criticism from the administration, several US military leaders plan to continue to push sustainability efforts. The Navy uses gas-electric hybrid warships at sea to reduce fuel usage, and the military produces enough renewable energy to power 286,000 US homes, according to the Department of Defense.

The Naval Air Station Oceana deep energy retrofit is a four-phase endeavor that is unprecedented in both size and scope. The project is projected to reduce energy use by over 40 percent across more than 100 retrofitted buildings, saving the naval base over $6 million in annual energy costs