1、二十一世纪世界各国石油需求量的更大份额将依赖于石油输出国组织提供：1986年全球石油需求量的25％系由石油输出国组织提供，而至1995年时此提供比例增至了35％～45％；专家预测二十一世纪初的2002年份美国石油需求量的2／3将依赖进口；2020年份全球石油需求量的50％将依赖 1. The larger share of oil demand in countries of the world in the 21st century will depend on the provision of oil exporting countries: In 1986, 25% of the global oil demand was provided by the Organization of Petroleum Exporting Countries, and by 1995 this proportion was increased. To 35% to 45%; experts predict that two-thirds of the 2002 U.S. petroleum demand in the early 2000s will depend on imports; 50% of global oil demand in the 2020 year will depend on