I think its a very interesting topic, and from what i've read its the only long term sustainable way to practice agriculture (who would have thought mimicking nature with minimal technological inputs works so well?
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The way forward is the way back, the problem is most of the farming in the US is done by a few multinationals using monsanto seeds/roundup/organophosphate pesticides, etc, etc. They kill the land, insects, affect human health, destroy soil fertility that took thousands of years to develop, etc. And its only profitable with mind boggling gov subsidies, green revolution my ass.
The great depression was the biggest kick in the balls to mom/pop small/sustainable farming, we went from most of the farmland owned by 30+ million farmers, to a few million land owning farmers, and multinationals owning most of the land and employing farm workers. In a time frame of a few YEARS. Its almost criminal.
Back on topic, permaculture in terms of practical application, would require a college level education in ecology/agriculture/biology/etc. Not to say you can't do it, or teach yourself how, but get a good education in the field, and it will be the best investment you ever made. Thats on of my dreams at least, go to school & learn how to do it right, then take the dive when i have the capital and start a farm somewhere.
But agriculture in and of itself is, on a small scale, something only the well educated, or well experienced/taught can do profitably. Most of the populace has abandoned this, and let multinationals provide their food and dont ask questions about how thats done/how it affects them. Kind of sad really.
"let those who have talked to the elves, find each other and band together" -TMK
In a society in which nearly everybody is dominated by somebody else's mind or by a disembodied mind, it becomes increasingly difficult to learn the truth about the activities of governments and corporations, about the quality or value of products, or about the health of one's own place and economy.
In such a society, also, our private economies will depend less upon the private ownership of real, usable property, and more upon property that is institutional and abstract, beyond individual control, such as money, insurance policies, certificates of deposit, stocks, etc. And as our private economies become more abstract, the mutual, free helps and pleasures of family and community life will be supplanted by a kind of displaced citizenship and by commerce with impersonal and self-interested suppliers...
The great enemy of freedom is the alignment of political power with wealth. This alignment destroys the commonwealth - that is, the natural wealth of localities and the local economies of household, neighborhood, and community - and so destroys democracy, of which the commonwealth is the foundation and practical means.” - Wendell Berry