The crucial question at the beginning of the 1990 ' s is whether the trend that began in the 1970 ' s will prove to be temporary or permanent . Is the era of cheap energy really over , or will a combination of new resources , new technology and changing geopolitics bring it back ? One key determinant of the answer is the staggering scale of energy demand brought forth by 100 years of population growth and industrial demand .

　　參考答案：

　　20 世紀90 年代初期人們關(guān)注的焦點在于，這個始于20 世紀70 年代的能源發(fā)展趨勢是暫時的還是長遠的。廉價能源時代真正一去不復(fù)返，還是通過開發(fā)新能源、應(yīng)用新技術(shù)、改革地緣政治秩序等措施，有可能重登歷史舞臺?回答這個問題的一個關(guān)鍵因素是，過去100 年以來因人口空前增長帶來對能源的巨大需求以及工業(yè)需求。