专家预测即将到来的21世纪的灾害中最严重者莫过于淡水匮乏。有人认为21世纪淡水资源的短缺将会危及人类的生存环境,给世界带来毁灭性的灾祸。淡水匮乏是下一世纪的头等灾祸,在本世纪末已经在世界上达到了共识。为此联合国可持续发展委员会向全世界呼吁,科学管理淡水资源、努力缓解淡水危机,并专门成立了世界水资源委员会。人类可用淡水少得可怜地球上到处是水。地球表面70%被水覆盖,然而那是海水。地球上97.5%的水都是被盐化了的咸水,只有2.5%的水是淡水。这些淡水中大概70%冻结在 Experts predict that the worst of the coming 21st-century disasters will be the lack of freshwater. Some people think that the shortage of freshwater resources in the 21st century will endanger the living environment of mankind and bring a devastating disaster to the world. Freshwater deprivation is the first of its kind in the next century, and consensus has been reached in the world by the end of this century. To this end, the UN Commission on Sustainable Development has called on the world to scientifically manage freshwater resources, work hard to ease the freshwater crisis and set up a special World Water Commission. There is little water available to mankind on Earth. 70% of the earth’s surface is covered by water, yet that’s sea water. 97.5% of the earth’s water is salinized saltwater, and only 2.5% of the water is freshwater. About 70% of these fresh water is frozen in it