[throw8383833jj]

there are many things that absolutely are scalable to the entire human race, at least outside of the city. Permaculture asks nothing of you but your effort. The "massive amount of labor put in is what's needed to produce that amount of food. It's only in rich countries where people can produce food for much less labor (by working a high paying job and buying the food at the market). there are many countries where people are much better off growing their own food, rather than working at a minimum wage job and buying the same food.

You should watch John Jai on Youtube. He's in thailand a country where the GDP per capita is a fraction of the US and yet he has more land, 3 small paid off huts and enough food to raise 4 kids all with plenty of time left over to read books. "Life is easy" he says, not bragging about his riches but rather to let people know about an alternative way of living.

[zeroCalories]

I agree that permaculture might be an option for some people, but the difference isn't gdp, it's that there are no productive things to do in many of these low income countries. If their economy advances enough they'll find that working a job provides more for them.