BY DANIEL YERGIN
An unconventional oil and gas revolution is under way in the United States, but its full ramifications are only beginning to be understood. The basic facts are clear enough. Half a decade ago, it was assumed that the U.S. would become a large importer of liquefied natural gas; now the domestic natural gas market is oversupplied, thanks to the ability to produce shale gas through hydraulic fracturing and horizontal drilling technologies.
Shale gas alone is now 10% of the overall U.S. energy supply. And similar technologies to recover so-called tight oil trapped in rock formations are largely responsible for boosting ...
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