近年来,冷淡了二、三十年的煤炭重新被重视起来了。煤炭本来是传统的重要能源。在廉价石油时代,煤炭的“能源之王”的宝座被石油夺走了。1973年,第一次石油冲击后,石油的廉价时代开始动摇。1979年伊朗政局变化,又引起了第二次石油冲击。两次冲击,使原油价格从1973年1月1日每桶2.41美元曾上涨到40 In recent years, the coal that has been cold for two or three decades has been re-emphasized. Coal has always been an important traditional energy source. In the era of cheap oil, the throne of coal’s “king of energy” was taken away by oil. After the first oil shock in 1973, the cheap era of oil began to falter. Political changes in Iran in 1979, but also caused a second oil shock. The two shocks have caused crude oil prices to rise to 40 from $ 2.41 a barrel on January 1, 1973