unless grandma was in the dust bowl, then she was just fucked
Two thoughts on this meme - self-reliance is necessary, and self-reliance is not sufficient, because if capitalism destroys the climate your homestead goes with it.
Self reliance isn't feasible, way to many people and not enough arable land. Plus you lose all benefits of specialization, putting you to pre industrial levels.
That math makes it 1,489 people per mile of arable land.
Edit: don't forget that not everyone lives on arable land. We also have apartments and skyscrapers that house people, thus packing in many more people per mile than individual.
Arable just means it's possible to turn it into farmland, not that it would actually be useful to grow crops.
The largest problem is that the global population has exceeded the natural limitations of the nitrogen cycle. Meaning we are utilizing more nitrogen from the soil than it can naturally fixate.
Without petroleum based fertilizers we wouldn't be able to sustain the global population we have today. Without the Haber-Bosch process our population would likely be hovering around 4 billion instead of 8 billion.
My math came out to one 41 meter square of land per person. 1.34b hectares/8b people*(100m*100m/hectare)=1675m^2/person which is a square of 41m per side.
I just don't think it's worth pursuing for it's own end. There are some things it makes sense to do yourself, but for most things it costs way to much time for the small amount of security it gives.
The post said it was necessary though. I'm fine with people working on self reliance if it makes them feel more secure, or just if they enjoy it or it gives them fulfillment. But I think relying on the social web of connections and commerce is fine.
I don't think OP was meaning you have to be 100% self sufficient. I interpreted it more that you need community but you also need to know how to take care of yourself. How are you going to help your community if you can't help yourself. How is your community going to help you if they don't know how to do things. Local supply chains doesn't mean you're producing everything, it means it's coming from your community. Thats exactly how an untold amount of people survived the depression, communities banding together and taking care of each other.
Most homesteaders help our their neighbors if it's needed, and will receive help when they need it. They're not 100% isolated on their own.
E: Why're y'all downvoting that guy. Not like they were being a dick or anything.