The good thing about ‘modern’ agriculture (ie: conversion of oil calories to food calories in an inert soil medium) is that it has gone as long as it has, ie: about 100 years. Now how could I say that this is good?
Well, this means that the wisdom of the elders, as recorded in publications and books, and which will form the basis of future agriculture are now mostly royalty free, since they have been around for so long. This, combined with the internet, means that the resources for the milennia of wisdom around sustainable agriculture can be made available to us for easily and at no cost.
So, while we still have time, take the time to peruse this treasure trove of resources available for free from the masters, the elders, the forefathers of permaculture.
-- Disobedience is the true foundation of liberty. The obedient must be slaves. - Thoreau