然而，粮食短缺和干旱的出现导致了一些地区的饥荒和灾难，而且工业和农业副产品也污染了水源。
Yet occurrences of food shortages and droughts are causing famine and distress in some areas, and industrial and agricultural by-products are polluting water supplies.
燃烧像农业副产品这样的生物废料是另一个应用规模较小的技术。
Burning of biomass, such as agricultural by-products, is another technology being put to use on a more limited scale.
研究结果表明，这些农业副产品通过此技术可提高其作为动物饲料的经济价值。
The research results indicate that it is possible to improve the economic value of these agricultural by-products as animal feeds through this fermentation technology.
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