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七十年代初期,世界性的石油危机使人们进一步认识到石油资源是有限的,并且不久将会枯竭。(根据最近美国石油研究所调查报告:1985年世界原油储量近7千亿桶,如按1984年产量估算可持续采掘36年)。1985年7月举行的国际能源机构会议强调指出,“在10年或者更短韵时间内,如果任何其他替代的燃料或提高效率的作法未取得明显的进展,那么,世界对石油
In the early 1970s, the worldwide oil crisis made people further realize that oil resources are limited and will soon be exhausted. (According to the latest research report of the American Petroleum Institute: World crude oil reserves in 1985 were nearly 700 billion barrels, for example, 36 years of sustainable extraction based on 1984 production estimates). The International Energy Agency meeting held in July 1985 emphasized that “in the course of 10 years or less, if any other alternative fuels or efficiency improvements have not made significant progress, then the world’s oil