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当今社会的一切经济活动、社会活动都极大地依赖着水资源的供应质量和数量.在我们星球上的水,96.5%集中在世界各大洋里.水量固然庞大,不过能为人类直接所用部分却很少.因为人类生活和生产活动用水要求淡水,而淡水只占总水量的2.5%.今天,人类所摄取的淡水量约占可用淡水量的8%,到2015年时,摄取量则要占到淡水资源的25%.现在可用的淡水中只有1.25万立方公里被有效使用,与2015年估计所需的淡水用量已相去不远.这样在有
All economic activities and social activities in our society today are greatly dependent on the quality and quantity of water supplied, and 96.5% of the water on our planet is concentrated in all the world’s oceans. Although the amount of water is huge, it can be directly used by mankind Few because human and productive activities require fresh water for freshwater, and freshwater is only 2.5% of the total. Today, human intake of freshwater accounts for about 8% of the available freshwater, and by 2015, To 25% of freshwater resources, only 12,500 cubic kilometers of freshwater available now are effectively used, which is not far from the estimated amount of freshwater needed for 2015. Thus,