Self-sufficiency
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Self-sufficiency refers to the state of not requiring any outside aid, support, or (in hardline cases) interaction, for survival; it is therefore a type of extreme personal or collective (group-based) .
Self-sufficiency is usually applied to varieties of sustainable living in which nothing is consumed outside of what is produced by the self-sufficient individuals. Examples of attempts at self-sufficiency in North America include voluntary simplicity, Luddism, homesteading, survivalism, and the Back to the land movement.
Practices that enable or aid self-sufficiency include autonomous building, permaculture, sustainable agriculture, and renewable energy.
The existence of an effectively closed system makes self-sufficiency a necessity for any form of space colonization. An extreme experimental example of self-sufficiency could therefore be said to be the Biosphere 2 project.
The term is also applied to more limited forms of self-sufficiency, for example growing one's own food or becoming economically independent of state subsidies or (in the case of larger political entities) foreign aid.
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