联合国今年 3日的一份水资源报告说 ,过去 2 5年 ,历次国际会议一再强调适当的水资源管理是人类赖以生存的核心问题 ,但始终难以得出有效的解决办法。全世界淡水资源供应形势依然十分严峻。192 0年至 1990年 ,全球人均水供应量减少了 1/3 ,今后 2 0年 ,有可能再减少 1/3 ,除非 A report by the United Nations on the 3rd of this year’s water resources said that in the past 25 years, the international conferences repeatedly emphasized that proper management of water resources is at the core of humankind’s existence, but it has always been difficult to draw an effective solution. The world’s fresh water supply situation is still very grim. From 1990 to 1990, the global water supply per capita has been reduced by one third, and it is possible to reduce by one third in the next 20 years unless