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Well, it depends on definitions I guess. Self-sufficient for me means, that you are able to produce or collect all or most of the things you need for a living yourself, maybe barter a bit with others. Now if you practice slash and burn, or chop forests down for agriculture or charcoal production you can be self-sufficient with that for the moment but in the long run it is not sustainable.
This way self-sufficiency does not necessarily always include sustainability.

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