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In our modern economy, consumption is the engine of prosperity. Disposable goods make room for next week's purchase. But as with energy, limited resources and a growing population imply eventual shortages -- along with growing mountains of poisonous waste, much of which could be reused or avoided. Sustainable development envisions food and water as existing in closed loops. It maximizes conservation and minimizes waste wherever possible.
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A dual water system provides treated water for drinking and re-uses "drain and rain" water for non-drinking purposes. |
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Run-off from eaves collects in "gray water" tank for use in plant irrigation. |
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Low-flow sinks and waterless toilets preserve potable water, which requires energy for treatment. |
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Kitchen waste goes into a compost for use as fertilizer on food crops. |
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Front-loading "horizontal axis" washer uses less water than a top-loader. |
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Solid human waste goes into a compost for use as fertilizer on non-food plants. |
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Sources: Landscape Architect, Eco-Urbanism, The Practice of Sustainable Development |
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