Well, it depends what you mean by "intensive". An intensively managed small farm can be very sustainable, esp. if both animals and plants are raised. Big old monocropping industrial ag, chicken factories, that kind of thing is just plain nasty.
The next poster is nostalgic for a time before his or her own personal memory.
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Concepts create idols; only wonder comprehends anything. People kill one another over idols. Wonder makes us fall to our knees.
-- Saint Gregory of Nyssa