Anarcho-primitivists share many characteristics with survivalists, most notably predictions of a pending ecological disaster. Writers such as Derrick Jensen argue that industrial civilization is not sustainable, and will therefore inevitably bring about its own collapse. Non-anarchist writers such as Daniel Quinn, Joseph Tainter, and Richard Manning also hold this view. Some members of the Men Going Their Own Way subculture also promote off-grid living and believe that modern society is no longer liveable.
Note: Yale’s withdrawal rate runs about 5%–a reflection of the market beating returns they’ve earned as an active investor. But the actual formula reflects a variable withdrawal rate because the planned draw for the coming year equals 80% of the current year’s draw plus 20% of the historical spending rate times applied to the endowment fund’s previous year’s ending balance.
For global catastrophic risks the costs of food storage become impractical for most of the population  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.
However, if some tales of survivalist stockpiling are to be believed, our nutty neighbors have enough of the social lubricant squirreled away to hold the most epic end-of-the-world-party of all time outside of Edgar Wright's social circle. It might not be practical, but who needs practical when you and everyone you know is doomed to die from radiation poisoning or cancer?
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. 
OK. Great. You've stockpiled for the end of the world, you quack. The chances of the world ending are smaller than ... holy crap, what the hell is a supervolcano? See why we're all doomed in 5 Ways The World Could End That You'd Never See Coming. And if that's not enough to get you to build your own bunker, check out 6 Tiny Mistakes That Almost Ended The World. Really, the planet almost ended due to a blown fuse? Come on humanity, let's get it together.
If you are trekking through the Yukon or trying to cross the Darien gap, you may find it necessary to wait weeks for help to reach you in a survival situation; but if you are just heading off to your local state park, emergency rescuers could probably reach you in a matter of hours. You’ll want to factor this consideration into your kit-building decisions. If you can expect to wait long periods before help will arrive, you’ll need more supplies than if you are heading out to an easily accessed area. Nevertheless, it is always wise to have the supplies to last longer than you think you’ll need them.
Every year in the US about 150 people die while out and about in national parks, more than 1,000 die in hunting-related incidents and thousands of backcountry enthusiasts get in deep trouble and require a Search and Rescue team to save them; with dozens of those folks dying while awaiting rescue. Most fatalities are the result of poor preparation. Bad weather descends and people get lost. They wander without water or shelter, often injuring themselves in the process. If they survive they often suffer frostbite, hypothermia, dehydration, trench foot or some combination of them all.
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?
Ugh, what a bummer! Your $250,000 underground compound was ready and rarin’ to go, a nuclear bomb was detonated and caused an EMP just like you said it would, but you didn’t get to say “I told you so,” because you died along with all of the idiotic unprepared. Just bad luck you weren’t near your EMP-safe bunker when this happened. You’re there 22 hours of the day, what are the odds? Hey world, I’d like a mulligan please!