AMERICA's NATURAL GAS REVOLUTION -- BY DANIEL YERGIN AND ROBERT INESON, The Wall Street Journal

A 'shale gale' of unconventional and abundant U.S. gas is transforming the energy market.

The biggest energy innovation of the decade is natural gas—more specifically what is called "unconventional" natural gas. Some call it a revolution.

Yet the natural gas revolution has unfolded with no great fanfare, no grand opening ceremony, no ribbon cutting. It just crept up. In 1990, unconventional gas—from shales, coal-bed methane and so-called "tight" formations—was about 10% of total U.S. production. Today it is around 40%,

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