The world's most abundant fossil fuel could be tapped without moving mountains, delivered without trucks or trains and burned without greenhouse-gas emissions. The technology to make this possible has been around for decades. Underground coal gasification was pioneered by Sir William Siemens in the 1860s to light the streets of London. Vladimir Lenin hailed the method in a 1913 article in Pravda for its potential to rescue Russians from the hazards of underground mines. Despite its early boosters, the technology never caught on in the U.S., mostly for cost reasons. Now the improvements in seismic mapping and drilling that lit a fire under the U.S. fracking boom may also spur development of a...
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