he bald snow tires on my ’06 Accord struggled to achieve the grip needed to summit Len Pense’s long, steep driveway. If the grid goes down the way he thinks it will, you’d need a tank to ascend the eroding gravel path because the 83-year-old Army veteran knows exactly which oak tree he’d fell across the route, lest the marauders come for his cache of, among many other things, 44 raised-bed gardens of food. One way in, one way out; that’s what sold Pense and his wife on the 21-acre hilltop property in Strafford some 25 years ago. 

Those impulses are not as contradictory as they seem. Technology rewards the ability to imagine wildly different futures, Roy Bahat, the head of Bloomberg Beta, a San Francisco-based venture-capital firm, told me. “When you do that, it’s pretty common that you take things ad infinitum, and that leads you to utopias and dystopias,” he said. It can inspire radical optimism—such as the cryonics movement, which calls for freezing bodies at death in the hope that science will one day revive them—or bleak scenarios. Tim Chang, the venture capitalist who keeps his bags packed, told me, “My current state of mind is oscillating between optimism and sheer terror.”
Individual survivalist preparedness and survivalist groups and forums—both formal and informal—are popular worldwide, most visibly in Australia,[93][94] Austria,[95] Belgium, Canada,[96] France,[97][98] Germany[99] (often organized under the guise of "adventuresport" clubs),[100] Netherlands,[101] New Zealand,[102] Russia,[103] Sweden,[104][105][106] the United Kingdom,[107] and the United States.[23]
Common preparations include the creation of a clandestine or defensible retreat, haven, or bug out location (BOL) in addition to the stockpiling of non-perishable food, water, water-purification equipment, clothing, seed, firewood, defensive or hunting weapons, ammunition, agricultural equipment, and medical supplies. Some survivalists do not make such extensive preparations, and simply incorporate a "Be Prepared" outlook into their everyday life.
Based on this crude but honest assessment of the general public's affinity for the common bicarbonate, you'd be surprised by how much survivalists are into it (#2 on the list of "things for preppers to hoard"). They must expect some pretty serious hankerings for tasty leavened baked goods, or they have extensive phobias about the funkiness of their nuke survival backup plans.

The reëlection of Barack Obama was a boon for the prepping industry. Conservative devotees, who accused Obama of stoking racial tensions, restricting gun rights, and expanding the national debt, loaded up on the types of freeze-dried cottage cheese and beef stroganoff promoted by commentators like Glenn Beck and Sean Hannity. A network of “readiness” trade shows attracted conventioneers with classes on suturing (practiced on a pig trotter) and photo opportunities with survivalist stars from the TV show “Naked and Afraid.”

The C.E.O. of another large tech company told me, “It’s still not at the point where industry insiders would turn to each other with a straight face and ask what their plans are for some apocalyptic event.” He went on, “But, having said that, I actually think it’s logically rational and appropriately conservative.” He noted the vulnerabilities exposed by the Russian cyberattack on the Democratic National Committee, and also by a large-scale hack on October 21st, which disrupted the Internet in North America and Western Europe. “Our food supply is dependent on G.P.S., logistics, and weather forecasting,” he said, “and those systems are generally dependent on the Internet, and the Internet is dependent on D.N.S.”—the system that manages domain names. “Go risk factor by risk factor by risk factor, acknowledging that there are many you don’t even know about, and you ask, ‘What’s the chance of this breaking in the next decade?’ Or invert it: ‘What’s the chance that nothing breaks in fifty years?’ ”
When bands of marauders start roaming the streets, how are you going to keep them out? Tear down a few walls, says Timothy Ferraro, a twenty-five-year construction veteran who's thought about this situation plenty while watching The Walking Dead. "Assuming the attackers don't have a battering ram, you should be able to keep them out using the lumber and drywall already in your home," he says.