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Articles by Dan Barry, Ian Urbinaand Clifford Krauss

THE NEW YORK TIMES
April 23, 2010
Earlier this year, in the subterranean workplace of a southern West Virginia coal mine, methane kept building up because of a lack of fresh air. Odorless, explosive, this natural gas must be dispersed from where miners work, and yet it became such a familiar presence at the mine called Upper Big Branch that entire sections had to be evacuated four times this year alone.
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