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ASSOCIATED PRESS
Newly-appointed science adviser John Holdren discusses geoengineering options as a "last resort" approach to counteracting the effects of global warming.

ASSOCIATED PRESS Newly-appointed science adviser John Holdren discusses geoengineering options as a "last resort" approach to counteracting the effects of global warming.

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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.