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1 引言已经有许多文章论述21世纪全球或地区范围内可供利用的水量和需要利用的水量。十分清楚,在今后几十年里,由于人口的不断增长和人均耗水量的提高,全球水的需求量将继续增长。应该承认,用我们现在的知识水平对2000年以后的水资源供求状况不可能作出准确的预测,而只能作出一般的估计。现在,我们对将来的水资源状况不能准确预测的原因很多,这里,只对其中一些主要原因进行简要的讨论。
1 INTRODUCTION There have been many articles on the amount of water available and the amount of water needed to be utilized globally or in the 21st century. It is quite clear that global demand for water will continue to grow in the decades to come due to the growing population and increased water consumption per capita. It should be admitted that it is impossible to make an accurate prediction of the water supply and demand after 2000 with our present level of knowledge, and only a general estimate can be made. There are many reasons why we can not predict the future state of water resources accurately. Only a brief discussion of some of the major causes is here.