水使用过之后的废水需要处理，而污水中的一些甲烷会逃逸到大气中。

After its use, the waste water then has to be treated, and some methane from the sewage escapes into the atmosphere.

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活动的积极分子认为，瓶装水使用到的塑料制品和运输所需的燃料都是不必要的消耗。

Activists say bottling water causes unnecessary use of plastics and fuel for transport.

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使用一个有断流器的水壶，这样水开后它会自动断电。

Use a kettle with an automatic cut-out so it doesn't boil for longer than necessary.

《柯林斯英汉双解大词典》