The Guantanamo Bay Naval Base has long been cut off from Cuba's energy grid, so officers have sought sophisticated ways to curb their energy and fuel use. Residents use bikes and solar-powered vans to move around the base, and engineers are experimenting with wind turbines, solar arrays and even algal biofuels to meet the base's energy needs. "The greening of Gitmo is important," says base commander Capt. Kirk Hibbert.

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