Such actions as discharging waste water to rivers not only pollute the environment but also become a danger to people's health.

像排放污水这样的行为不仅污染了环境，还成为了人民健康的威胁。

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But the old-fashioned way to save on utility costs is simply to conserve electricity or waste less water.

而最传统的节约水电费开支的方法就是尽量节约用水用电。

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But Kizirolu says the duck "is threatened by the level of industrial waste and the decreasing water levels in the lake."

但是克孜罗说“这种鸟除了受到了当地的工业废弃物的排放度的影响外，还受到这个湖泊中水位的下降度的影响。”

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In developing countries, the main source of water pollution is not stormwater,but waste water.

VOA: standard.2010.08.04

But water companies needed to invest in the sewer network to ensure untreated waste water was only released in urgent cases.

BBC: Charity warning over raw sewage discharge levels

Successful Green Cities: Examples of cities undertaking sustainable practices in specific sectors, such as energy supply, buildings, transportation, water and waste, but are there cities that are taking an integrated approach greening multiple sectors concurrently?

UNESCO: Social and Human Sciences

But the other 45% of recycled waste water was simply discharged at sea or released on to the land, where it had been pushing up groundwater levels, and eventually resulted in the creation of Lake Zakher.

CNN: Man-made desert lake: Ecological paradise or disaster?