Twelve leverage points
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oxygen
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nature
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lake
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International Standard Book Number
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atmosphere
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nervous system
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atmosphere of Earth
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ecosystem
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pollution
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unemployment
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hunger
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system
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Margaret Mead
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evaporation
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cybernetics
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Edsger W. Dijkstra
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Ilya Prigogine
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Q178577
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heat capacity
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nutrient
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