The shale revolution
Several years ago, it looked as though the United States was running short of natural gas. Prices spiked as declining production in old fields collided with increasing industrial demand. Electric utilities shifted from 'clean' gas back to cheap coal, and suppliers began building terminals to import liquefied natural gas from abroad. Yet today, coal-fired power is again on the wane, ports for liquefied natural gas are idling below capacity, and the nation is awash with gas.