他们发现，溪流中一氧化二氮的数量与人类活动释放到环境中的氮有关，如使用化肥和污水排放。

They found that the amount of nitrous oxide produced in streams is related to human activities that release nitrogen into the environment, such as fertilizer use and sewage discharges.

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其实比所扬言的要简单得多。科学家们正在开发一种系统利用在污水容易滋生的细菌产生氧化氮，通过火箭推进器燃烧耗尽。

It's actually simpler than it sounds — the scientists are developing a system that exploits sewage-loving bacteria to produce nitrous oxide, which can be used up by a rocket thruster.

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事实上，OMEGA系统不光可以清理污水，而且还可以帮助阻止二氧化碳现象的恶化。

The fact that the OMEGA process would clean up wastewater and help sequester carbon dioxide doesn't hurt, either.

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