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Back to the Stone Age
A New York City firefighter stores food and water in his apartment, fearing the eruption of the Yellowstone supervolcano; a Southern man believes America is on the brink of hyperinflation and prepares for civil unrest by stockpiling guns, ammunition and alcohol for trade; a Phoenix man prepares for an electromagnetic pulse (EMP) attack on America by building a compound outfitted for survival purposes and teaching his sons to defend it with weapons.

Source: National Geographic Channel