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世界正在走进一个缺水的时代。据联合国环境规划署2002年报告:“全世界约有1/3的人生活在中度和高度缺水地区”。该机构2007年报告进一步指出:“到2025年,全球将有18亿人口生活在绝对缺水的国家和地区.世界上将有2/3的人口面临缺水的压力.即水资源量可能达不到他们满足农业、工业、家庭、能源和环境用水需要的临界值”。对于人均可再生淡水资源仅为世界人均水平1/3的中国,将面临的缺水压力不言而喻。然而,在许多情况下.缺水并非是水少了,而是缘于
The world is entering an era of water shortage. According to the 2002 report of the United Nations Environment Program: “About one third of the world’s population live in moderately and highly water-stressed areas.” The agency’s 2007 report further states: “By 2025, 1.8 billion people will live in absolute water shortages in the world by 2025. Two-thirds of the world’s population will be under water stress, Can not meet their critical needs of meeting the needs of agriculture, industry, family, energy and environment. ” For China, where per capita renewable freshwater resources are only one-third of the world average, the pressure of water shortage will be self-evident. However, in many cases, water scarcity is not water but rather water