http://www.greenwizards.org/ (Resources don't show you anything useful until you create free account.)
started by John Michael Greer
The wizard of the early Middle Ages in Europe and the Muslim world, rather, was a freelance intellectual whose main stock in trade was good advice, though admittedly that came well frosted with incantation and prophecy as needed. He had a good working knowledge of astrology, which filled roughly the same role in medieval thought that theoretical physics does today, and an equally solid knowledge of ritual magic, but his training did not begin or end there. According to Picatrix, the compleat wizard in training needed to get a thorough education in agriculture; navigation; political science; military science; grammar, languages, and rhetoric; commerce, all the mathematics known at the time, including arithmetic, geometry, music theory, and astronomy; logic; medicine, including a good knowledge of herbal pharmaceuticals; the natural sciences, including meteorology, mineralogy, botany, and zoology; and Aristotle’s metaphysics: in effect, the sum total of the scientific learning that had survived from the classical world. (Renaissance Man)
"One of the things the soon-to-be-deindustrializing world most needs just now is green wizards. By this I mean individuals who are willing to take on the responsibility to learn, practice, and thoroughly master a set of unpopular but valuable skills – the skills of the old appropriate tech movement – and share them with their neighbors when the day comes that their neighbors are willing to learn. This is not a subject where armchair theorizing counts for much – as every wizard’s apprentice learns sooner rather than later, what you really know is measured by what you’ve actually done – and it’s probably not going to earn anyone a living any time soon, either, though it can help almost anyone make whatever living they earn go a great deal further than it might otherwise go.
That’s what the green wizard toolkit is meant to do. Those who have a place in the country or can get one won’t have any need to depend on a faltering corporate food system for their daily meals; those who focus instead on the small-city (Urban Village) approach will be able to supplement sacks of bulk grains and legumes from the farm belt (Big-Ag) with produce from a backyard garden (Kitchen Garden), amplified with Hen House and/or rabbit hutch as circumstances permit. Those in either situation who know how to insulate and weatherize, and provide the small amount of energy they need from homescale sources, will be able to ignore the decline of the Electric Energy grid. Those who learn how to get the things they need from salvage, instead of relying on global supply chains fed from rapidly depleting resource stocks, will be able to stand aside as what’s left of the global economy circles the drain and goes down it. Those who do these things, teach these things to neighbors and friends, and help build local networks of mutual exchange and support, will be creating the social frameworks of the next stage of the future – the stage of salvage societies – within the crumbling skeleton of the old industrial order.