The birds' waste then fertilizes fields.

随后，禽类的粪便可以肥沃田地。

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"What a waste it is," he was to write years later, remembering his work in the fields, "for a human being to spend hours and days behind a slowly moving team of houses."

后来他在回忆他的这段农庄生活时写道：“一个人整天跟在一群慢腾腾的马后，这是多么大的浪费呀。”

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Each morning they rise up in vast, graceful waves and fly to fields nearby, where they spend their days assiduously feeding on waste corn the harvesters missed and earthworms and other invertebrates.

每天早上，它们从广阔优美的波浪中起飞，飞到附近的田野，全力以赴地吃着收获者遗留下来的玉米和蚯蚓及其它无脊椎动物。

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The picture it paints of life in America at that time -- the parties,the automobiles, the endless fields of waste -- are unforgettable.

VOA: special.2010.11.28

But,unlike city sewage, this waste sits in lagoons and is spread untreated on farm fields as fertilizer.

VOA: standard.2010.05.06

Thou saw the fields laid bare an waste, An weary winter comin fast.

BBC: Last Updated: Tuesday January 25 2005 15:24 GMT

Considering the opportunities to treat gas that would otherwise be flared, to unlock otherwise uneconomic shale and conventional gas fields, and increasing opportunities for biomass, waste and coal conversion, small-scale GTL may well have a significant niche to fill in our emerging energy picture.

FORBES: Gas-to-Liquids Plants: No Longer Exclusive to Larger Players

Even the waste from the waste is put to good use -- the waste from the bio-fermentor is used as a natural fertiliser in the barley fields.

CNN: Brewing giant Carlsberg's sustainability drive pays off