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2012年12月5日,美国能源局发布了2013年度能源展望(AEO2013)参考案例。报告指出,直到2040年,美国能源面临的突出问题是能源生产的增长速度超出能源消耗的增长速度。“美国能源局更新的参考案例展示了消费者偏好的演变、技术的进步以及经济上的变化,这将推动美国提高能源生产效率,更重视使用清洁能源,以及减少能源进口。”美国能源局某行政官说,
December 5, 2012, the United States Department of Energy released the 2013 annual energy outlook (AEO2013) reference case. The report pointed out that until 2040, the prominent problem that the U.S. energy faces is that the growth rate of energy production exceeds the growth rate of energy consumption. “The updated US Department of Energy reference illustrates the evolution of consumer preferences, technological advancements, and economic changes that will drive the United States to increase its energy production efficiency by placing greater emphasis on the use of clean energy and reducing the import of energy.” " An administrator of the bureau said: