Have a look at this video featuring Sepp Holzer, an expert permaculturist. Permaculture involves farming in cycles, modeling itself on self sufficient, natural ecosystems.
Holzer's farm 'Krameterhof' in Salzburg attracts many visitors wanting to learn about his methods and techniques and he is only too happy to pass on all that he knows. This farm is so successful it provides a surplus of food for the community as well as sustaining the varied plant and animal life.
As Holzer says "create natural cycles, then nature will work for you!"
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