But, despite the anxious rhetoric, the oil-supply problem has become worse and energy security more complex. Notwithstanding politicians’ repeated calls for energy independence, over the past 30 years the United States, for example, has doubled its dependence on imported oil, which now accounts for nearly two-thirds of its oil needs.
三十年来，富有国家一直在谈论限制其对进口石油的依赖。但是，尽管人们焦急地发表长篇大论，石油供应问题变得愈加严重，而能源安全则更为复杂。尽管政坛人物们不断呼吁能源自给自足，但是，以美国为例，在过去30年中其对进口石油的依赖增加了一倍。进口石油已经占到其石油需求的将近三分之二。