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20世纪 ,随着科学技术的不断进步和社会生产力的极大提高 ,人类创造了前所未有的巨大物质财富 ,也加速推进了社会文明发展的进程。但与此同时 ,人口剧增 ,人类生存空间越来越狭小 ;资源过度消耗 ,使陆地资源日趋紧张 ;环境污染 ,生态破坏 ,也使人类生存条件不断恶化。这些全球
In the 20th century, with the continuous improvement of science and technology and the great increase of social productive forces, mankind has created an unprecedented huge material asset and accelerated the process of social civilization development. However, at the same time, the population is increasing rapidly and the living space of human beings is getting narrower. Over-consumption of resources has led to the tightening of land resources. Environmental pollution and ecological destruction have also deteriorated the living conditions of mankind. These global