The increased inflation rate in the 1960s, the US monetary devaluation, the continued concern over a possible nuclear exchange between the US and the Soviet Union, and perceived increasing vulnerability of urban centers to supply shortages and other systems failures caused a number of primarily conservative and libertarian thinkers to promote individual preparations. Harry Browne began offering seminars on how to survive a monetary collapse in 1967, with Don Stephens (an architect) providing input on how to build and equip a remote survival retreat. He gave a copy of his original Retreater's Bibliography to each seminar participant.
After his instructional on seed saving, Nocks tells me that in 2006, God told him to move his family from a 5,000-square-foot home in Lee’s Summit to a simpler life in the Ozarks, where he now has the supplies to last himself, eight adults and nine children at least six months. “God was just leading us to be more simple-minded,” he says. Nocks isn’t alone in his migration. Preppers fear marauders: Being robbed by unprepared neighbors and even family members is a universal concern. To survive a catastrophe, Nocks says, move out of town and shut up about your stash.
By his own estimate, Pense says there are a few thousand people in the Springfield area who have listened and who are ready. The preppers. Most don’t like to be called preppers because of the connotation that they’re crazy; Chicken Little wasn’t well-received by his people, either. Most don’t even like to talk about it, but a few of them do. So for three months toward the end of 2017, I sought out the doomsday survivalists to find out: Is it really crazy to live like the sky is falling?
People who carefully and painstakingly prepare for mass extinction don't exactly seem like the type of people who plan great parties. At least, with those vast collections of guns, ammo, and other terrifying armaments, I certainly hope not. Then again, I suppose everyone will need a drink or 10 to get through the inevitable horrors of forever navigating the "what's for dinner" question without Seamless or, you know, realizing that your urban-dwelling family members will probably never arise from the blasted pit of rubble where their apartments once stood.
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This group stresses being able to stay alive for indefinite periods in life-threatening wilderness scenarios, including plane crashes, shipwrecks, and being lost in the woods. Concerns are: thirst, hunger, climate, terrain, health, stress, and fear. The rule of 3 is often emphasized as common practice for wilderness survival. The rule states that a human can survive: 3 minutes without air, 3 hours without shelter, 3 days without water, 3 weeks without food. 
David Sarti, a YouTube "firearms instructor" and self-taught survivalist, is prepared for an electrical grid failure; Kellene Bishop of Utah has stocked only the finest gourmet survival foods in preparation for financial collapse; Kathy Harrison, "the Doris Day of Doom", has prepared her local community for a New Madrid earthquake; Dennis Evers brings the family together to survive global chaos caused by hyperinflation.
According to Hobel, shelter is your first priority. Lay down cardboard and other materials to insulate yourself from the ground. (Even in summer, the ground can have temperatures that lead to hypothermic conditions.) Use tarps, blankets, pillows—whatever you can find—to build the shelter on that layer. It should be as low to the ground as possible, and you shouldn’t be able to sit up when you’re inside, Hobel says. Other than the airflow you need to breathe, block all openings to keep cold air from coming in. It’s a matter of conserving heat. A lot of people don’t realize that their bodies are heat sources, Hobel says. You’re almost 100 degrees. Trap that heat around you instead of letting it rise in a tall shelter, and you won’t need a fire to stay warm.