Sugar cane was the only crop shown to have a favourable balance of greenhouse gas savings and emissions, because it requires less fertilizer than other biofuel crops.
甘蔗是唯一一种表现出可以让温室气体排放净减少的作物，因为它需要的化肥少于其他生物燃料作物。
2
In one coal power plant in Poland, flue gas is converted into sulfur and nitrogen byproducts that can be used as fertilizer.
在波兰的一家燃煤电厂，烟气被转化为硫和氮，这些副产品可以用作肥料。
3
“That’s just enough to pay for the gas and fertilizer, ” he said.