Survivalism, the practice of preparing for a crackup of civilization, tends to evoke a certain picture: the woodsman in the tinfoil hat, the hysteric with the hoard of beans, the religious doomsayer. But in recent years survivalism has expanded to more affluent quarters, taking root in Silicon Valley and New York City, among technology executives, hedge-fund managers, and others in their economic cohort.
The movement received another boost from the George W. Bush Administration’s mishandling of Hurricane Katrina. Neil Strauss, a former Times reporter, who chronicled his turn to prepping in his book “Emergency,” told me, “We see New Orleans, where our government knows a disaster is happening, and is powerless to save its own citizens.” Strauss got interested in survivalism a year after Katrina, when a tech entrepreneur who was taking flying lessons and hatching escape plans introduced him to a group of like-minded “billionaire and centi-millionaire preppers.” Strauss acquired citizenship in St. Kitts, put assets in foreign currencies, and trained to survive with “nothing but a knife and the clothes on my back.”
For global catastrophic risks the costs of food storage become impractical for most of the population [54] and for some such catastrophes conventional agriculture would not function due to the loss of a large fraction of sunlight (e.g. during nuclear winter or a supervolcano). In such situations, alternative food is necessary, which is converting natural gas and wood fiber to human edible food.[55]
Others featured on Doomsday Preppers are more out there — literally. Robert and Debbie Earl, retired Florida chicken farmers, worry about the seas rising. So they are building a home constructed of old tires and sand-filled bottles near Alpine, Texas. Robert Earl describes himself as "Mad Max meets Rube Goldberg with a little bit of Al Gore thrown in."
For an hour and 50 minutes, we talk a lot about liberty. The world according to Fletch hinges on the rhetorical question, “Is this going to give me more liberty, or less liberty?” He also assures me that his survivalist group isn’t just white guys running around in the woods with guns. “In my sphere of influence, there are Asians, there are blacks, Native Americans; a person’s race has absolutely nothing to do with anything,” Fletch says.

Untold numbers of people wind up suffering frostbite, shock or hypothermia every year because they didn’t have adequate survival gear when the weather on their wilderness adventure took a rapid turn for the worse. But it doesn’t have to be that way. The Titan 2-sided Mylar Survival Blanket is light as a feather and yet capable of retaining up to 90% of your body heat.

During the dinner rush, the Pizza Hut on Glenstone Avenue is a kinetic juxtaposition: fast-moving people behind the counter, slow-moving people in front of it. Carbohydrate osmosis, I assumed. Earlier that afternoon in the Starbucks down the road, Randall told me Andrew:’s meetup group might be here. He’d been hosting meetups in the gymnasium of the Seventh-day Adventist Church on Belview Avenue, but the church disinvited the preppers after clergy leader and RN Janis Hall witnessed Andrew: deliver a scathing diatribe against modern medicine. But here, judging by the veterans’ hats, overalls and waistband cell phone holsters crowding the salad bar, I knew I was in the right place. 
Car electricity runs on direct current, but almost everything else is alternating current. What you need: an inverter. Some cars have them built in, but you can get one at a store for less than $40. Use the clamps to attach the inverter directly to the terminals on your car battery. Let the car run at idle and you have 110-volt AC power for as long as you have gas. With a 300-watt inverter, you'll have enough amps to run a laptop or even a television.