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In the U.S., the Obama administration has been a big advocate for solar energy, with Mr. Obama recently touring and speaking at Sempra's Copper Mountain Solar 1 facility in Boulder City, Nev. (Associated Press)

In the U.S., the Obama administration has been a big advocate for solar energy, with Mr. Obama recently touring and speaking at Sempra's Copper Mountain Solar 1 facility in Boulder City, Nev. (Associated Press)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.