论文部分内容阅读
全球性的人口增长,以及继之而起的都市化和人口集中的问题,粮食、水及廉价燃料的不足和自然环境的污染等问题,这是无论发达国家还是发展中国家都面临着的难以解决的问题。据联合国统计,世界人口现在大约是43亿,到2000年将增加到63亿。在此期间城市内将增加两倍。因此,可以预料,世界上不同地区特别是发展中国家,都将面临着巨大的增长。世界对自然资源的战斗,将比以往任何时候都更为紧张,将出现大量的为保证适当的水、食
Global population growth, the ensuing urbanization and population concentration, the shortage of food, water and low-cost fuels and the pollution of the natural environment are difficult problems for both developed and developing countries solved problem. According to the UN statistics, the world’s population is now about 4.3 billion and will increase to 6.3 billion by 2000. In the meantime, the city will triple. Therefore, it can be expected that different regions in the world, especially the developing countries, will face tremendous growth. The world battle over natural resources will be more intense than ever before, and there will be plenty of opportunities to ensure proper water and food