The greenhouse gas figure equates to 18% of man-made greenhouse gas emissions, largely thanks to the methane and nitrous oxide animals' "enteric fermentation".
畜牧业产生的温室效应气体，大部分由甲烷沼气和动物肠内发酵及粪尿处理产生的氮氧化物，总量占到人为产生温室气体的18%。
After the methane tank has been built, all links of the fermentation starting are the keys of producing the quality gas early.
沼气池建成后，发酵启动的各个环节是早产气、产好气的关键。
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