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Water is one of the most valuable resource in the world, is the ideal liquid to sustain life. Mammals in vivo is between 60% and 65% water, two-thirds of the human body weight, 99% of the brain, bones are about 44% water. Lack of water, the human and the earth will not survive, forests will disappear, the plant will perish, the earth will appear the boundless desert, signs of life will disappear.

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Currently the world's fresh water accounts for only 2.5% of the total water resources, of which more than 70% is frozen in the arctic and Antarctic ice sheets, and it is difficult to use the snow on the mountain glaciers and permafrost, 87% of the fresh water resources is difficult to use. Humans really able to take advantage of the freshwater resources is part of the rivers and lakes, and groundwater, accounts for about 0.26% of the earth's water.

Given the global freshwater resources shortage, not only will soon fall into the predicament of the water shortage in many countries, economic development will be limited, on January 18, 1993, the 47th United Nations general assembly resolution, determine the annual March 22 as "world water day". After the water act of the People's Republic of China promulgated in 1988, the ministry of water resources is to determine the annual July 1 to 7 as "China's water week", considering the "world water day" and "China water week" the purpose and content of basic same, therefore, starting from 1994, change the time of "China's water week" to the annual March 22 to 28, time coincidence, make a campaign more highlights the theme of "world water day".

水是世界上最宝贵的一种资源，也是维持生命的理想液体。哺乳动物体内60%至65%是水，人类体重的2/3、大脑的99%、骨骼的44%也都是水。缺了水，人类和地球将不能存活，森林将不复存在，植物将灭亡，地球上将出现无边的沙漠，生命的迹象将消失。

目前全世界的淡水资源仅占其总水量的2.5%，其中70%以上被冻结在南极和北极的冰盖中，加上难以利用的高山冰川和永冻积雪，有87%的淡水资源难以利用。人类真正能够利用的淡水资源是江河湖泊和地下水中的一部分，约占地球总水量的0.26%。

鉴于全球淡水资源不仅短缺、许多国家将很快陷入缺水的困境，经济发展将受到限制，1993年1月18日，第47届联合国大会作出决议，确定每年的3月22日为“世界水日”。1988年《中华人民共和国水法》颁布后，水利部即确定每年的7月1日至7日为“中国水周”，考虑到“世界水日”与“中国水周”的主旨和内容基本相同，故从1994年开始，把“中国水周”的时间改为每年的3月22日至28日，时间重合，使宣传活动更加突出“世界水日”的主题。