Albert Howard - Agricultural Testament - https://www.goodreads.com/book/show/2225725.Agricultural_Tes...
Sepp Holzer's Permaculture: A Practical Guide to Small-Scale, Integrative Farming and Gardening - https://www.goodreads.com/book/show/10023218-sepp-holzer-s-p...
Masanobu Fukuoka - The One-Straw Revolution - https://www.goodreads.com/book/show/976905.The_One_Straw_Rev...
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You can read these books at archive.org.
https://archive.org/details/in.ernet.dli.2015.270767
https://archive.org/details/SeppHolzersPermacultureAPractica...
In my city there's a club you pay a tiny monthly amount to get fruits delivered. And you can become a partner very easily.
Folks definitely get yields of more than a snack or 2 out of food forests. Growing food from perennials in a multi-layered food forest is very efficient (minimum inputs), resilient (diverse layers designed to support each other, plants that are of age and established, healthy soil) and has many outputs (food, timber etc). Bill Mollison explains the birth of the idea here [0].
I am convinced that they are a key piece of the future if we are to feed the 9 billion people you speak of. I am also becoming convinced that industrial agriculture's tendency to plant vast amounts of monocultures does not have a place in that future.
Food forests are promoted through permaculture. The entirety of a permaculture farm wouldn't usually be dedicated to a forest like this. Grains have a place. So does meat.
There are plenty of permaculture farms out there producing meat, and it's not uncommon for this to take place in woodland. Within a forest you may find pigs and poultry[1]. As a part of a permaculture farm's systems there may be pastured cattle, poultry[2][3] and so on. Within this sphere you find farms like Mastodon Valley[4], where cattle are a key part of their regenerative agriculture. Then you have ponds designed for fish[5].
[0] https://www.youtube.com/watch?v=JrtJbk8_GY8&t=16m20s
[1] https://youtu.be/GVQ8TUpvnDY?t=3m28s (woodland in this case, not a food forest)
[2] https://youtu.be/3Knn7ZH4Tiw?t=39m28s (a system where chickens follow cows in pasture)
[3] https://youtu.be/eFujalK2jHg?t=32m12s (using chickens to disturb an area in prep for establishing a new section of a food forest... continue watching for a few minutes to see an impressive chicken-pinning dog!)
[4] https://mastodonvalleyfarm.com
[5] https://www.youtube.com/watch?v=e2B2Nyji7v0 (establishing a fish pond and using cows from the farm as helpers)
Lets hope it wont be too late
Despite people's knee-jerk reactions, allowing the population to decrease doesn't have to mean anything about eugenics and economics doesn't require growth. On the contrary, growth and even staying at current levels have many problems.
The belief that we need to grow is carrying us toward disaster.
I can't agree with this more.
We need to think about an alternative to it.
(I have a 2 acre 'food forest', I'm not a 'Big AG apologist' or any of the dozens of other things I've been called over the years - I'm just realistic)
As tech evolves tho, I think we'll see chemical pesticides and herbicides replaced with mechanical solutions instead.
The world doesn't necessarily need to use industrial agriculture to achieve the same yields, the alternative is to be having many more farmers working smaller a plots and actually getting better yields from it.
Now, I do agree with you that with even better technology than we have now, we can replace much of what we need chemistry for with mechanical solutions. Although, chemical application with modern systems can be dosed on areas measured in square feet, a long way from the 'a bit of nitrogen is good so double the amount is better' mentality of a few decades ago. But the future of agriculture is not in 'back to land' or 'permaculture' style farming. It's in more technology, not less, and less labor, not more.
I'd take environmental degradation over slavery, to be honest.
This is not remotely true, unless you buy into the ridiculous Ausubel et al paper. Most conservative projections have it at 2040 for peak arable land, which is not the same as being out of agricultural space, and certainly not the same as denying climate change.
Efficiency of arable land per hectare is through the roof and continues to improve every decade by increasing multiplicative factors due to consolidation, regulation, and technology.
The problem is not food development, arable land, or generating calories at all. It is entirely in the distribution of the food and the political ramifications of such.
https://www.youtube.com/watch?v=ng-VskDFPpM
That is the video that led me to it, but after I saw it I went back through his video history to see how he got the whole project started and to see his progress over the years. He has a video in there where he recommends a series of books that he learned from, like Albert Howard's "An Agricultural Testament," Sepp Holzer's "Permaculture," and Masanobu Fukuoka's "One Straw Revolution." I've gotten started reading the first two and they're really great books.