页岩气、煤层气等非常规天然气的技术发展将对满足天然气消费有帮助,但不必期待它们改变供应结构甚至带来廉价能源。几年前,世界经济危机骤起,美国新政府在寻找新的经济发动机时将“绿色能源”作为发力点,尽管并不确定其成效将如何。几年过去了,更多的能源品种已经让人们看到了突破,尽管其未来仍有不确定性。最大的亮点是页岩气和近来的页岩油,北美石油开采量甚至可能因此而翻番。当然,要达致这种结果 Technological developments in unconventional natural gas such as shale gas and coalbed methane will help meet gas consumption but do not expect them to change the supply mix or even bring in cheap energy. A few years ago, when the world economic crisis soared, the new administration of the United States made “green energy” as the starting point when it came to finding a new economic engine, though its effectiveness was not certain. A few years later, more varieties of energy have made people see a breakthrough, although there are still uncertainties in the future. The biggest bright spot is shale gas and recent shale oil, North American oil extraction may even double as a result. Of course, to achieve this result