Gas works

摘要

Pennsylvania, The Site of America's first oil wells back in the 1850s, is now home to the world's second-largest gas field after South Pars, on the border between Qatar and Iran. At the turn of the millennium America's conventional gasfields were in decline. The country was preparing to become a significant importer: around $100 billion was invested in lng import terminals that may now be redundant. Shale gas was known to geologists but had never been worth extracting.