Using seawater directly is an effective solution to save fresh water for cities near the sea. Using seawater for flushing toilets is a great water-saving project as one of the direct uses of seawater.

对于沿海城市，海水直接利用是解决淡水供求矛盾的最有效途径，海水冲厕就是其中一项具有重大节水意义的工程。

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By mid-century, two-thirds of the world's population will live in cities. The demands for energy, water, housing, and education will be enormous.

到本世纪中叶，世界人口的三分之二将居住在城市，对能源、水、住房和教育的需求将是巨大的。

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But more water is being drawnfrom them for cities, irrigation and the processing of oil from tarsands.

一方面却有更多的河水被抽走，供应城市、灌溉和沥青炼油所需。

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That also means less water for thirsty cities, including Delhi, where 18m people live and the water board meets around half their demand in a good year.

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For instance, the melting snow pack in the Sierras could reduce the water supply for cities and agriculture.

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But the apparent scarcity of water for thirsty cities and suburbs largely reflects its profligate use by farmers, who pay almost nothing for the stuff.

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