Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.

在许多国家，数以百万计的灌溉井现在从地下水源抽水的速度，超过了降雨所能再次填满的速度。

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Irrigation: No untreated sewage water may be used for irrigation. Irrigation methods should take into consideration sustainability of the water sources and the quality of the water.

灌溉：任何没有经过处理的污水沟都不能用于灌溉。使用的灌溉方法要考虑到水资源的可持续性和水的质量。

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Irrigation methods should take into consideration sustainability of the water sources and the quality of the water.

使用的灌溉方法要考虑到水资源的可持续性和水的质量。

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But many of the necessary irrigation channels were themselves destroyed in the tsunami, while the water sources that feed them may also have been contaminated.

ECONOMIST: The tsunami