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The increasing use of dried animal waste as a substitute fuel has also hurt the soil because this valuable soil conditioner and source of plant nutrients is no longer being returned to the land.

人们开始越来越多地使用脱水后的动物粪便作为替代燃料，这同样会损害土壤，因为这些珍贵的土壤改良剂和植物养分的来源将无法再回归到土壤之中。

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Melbourne researchers have truly applied the old adage ‘waste not want not’, turning fruit by-products into a rich source of antioxidants for human health. Nerissa Hannink reports.

本大学研究者已确凿证实一句古话：精打细算。妮丽莎汉宁科报道说他们将水果的副产品转成了人身体健康的充足来源——抗氧剂。

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In developing countries, the main source of water pollution is not stormwater,but waste water.

VOA: standard.2010.08.04

That basic idea of looking at the waste products as the source of raw materials is the what on earth.

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Vegetables that grow on the ground are more likely to be contaminated with bacteria, since runoff from animal waste is likely the source of contamination.

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As higher chicken feed costs push multi-national chicken firms like Pilgrim's Pride and Tyson's Food to report losses this year, Abdel Hadi says crayfish waste is an alternative source for the protein and minerals necessary to raise chickens.

CNN: The incredible, edible crayfish?