水,就像空气一样,是人类生存不可缺少的基本物质。然而,读者是否知道,我们这个世界的水资源正在枯竭,人类正在以惊人的速度消耗并污染着作为一切生命之源的水。如果不改变人类目前的用水方式,全世界在25年内将有30%～50%的人陷入极为缺水的状态。由于人们对水的需求量越来越大,而自然水源却不可能随之增长,所以 Water, like the air, is an indispensable basic material for human existence. However, does the reader know that the water resources in our world are depleting and that humans are consuming water at an alarming rate and polluting it as the source of all life? Without changing human’s current water use, 30% to 50% of the world’s population will be in a state of extreme water shortage within 25 years. Due to the increasing demand for water and the increase of natural water sources,