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Waste is part of life. Human and animal bodies produce natural waste, whereas societies produce synthetic waste. While we cannot control the level of natural waste as its production is an organic part of biological survival, we can drastically reduce the production of synthetic waste. Natural and synthetic waste come in two varieties - reusable and nonreusable. The aim of a sustainable waste economy is to reuse as much waste as possible, even to the point of reducing waste surplus to zero.