从表面上看,地球上的水资源很丰富,因为地球71%的面积是被水覆盖的。但这些水面的97.5%是咸水。如果不算两极的冰层,那么人们容易得到的淡水只有地球上总水量的0.26%。此外,这些水资源也很难再分配,因为9个国家已经占去了这些水资源的60%。这些国家是:巴西、俄罗斯、中国、加拿大、印度尼西亚、美国、印度、哥伦比亚和扎伊尔。在2050年以前,全球人口可能将增加近1倍,而 On the surface, the earth is rich in water because 71% of the Earth’s surface is covered by water. But 97.5% of these are saltwater. If it is not the polar ice, then freshwater that people easily get is only 0.26% of the total water on Earth. In addition, these water resources are also difficult to redistribute because nine countries already account for 60% of these water resources. These countries are: Brazil, Russia, China, Canada, Indonesia, the United States, India, Colombia and Zaire. By 2050, the global population is likely to have nearly doubled