June 30, 2014 11:50 by Alice
WUKY NPR @91.3 recently broadcasted a story about "WHAT LIES BENEATH: Researchers Turning Attention to Underground Coal Fires".
The story discusses how coal fires can start and how researchers at the UK Center for Applied Energy Research are gathering information on such fires in Kentucky. Some of the coal fires in the US have been burning for decades and they're tough to put out.
Jim Hower has been investigating these fires since 2007 and says that conditions like amount of smoke and ground temperatures change from one visit to the next. A number of things can start the fires, from forest and grassland fires igniting exposed coal beds, to arson, … even spontaneous ignition under some conditions. According to Hower, thousands of uncontrolled coal fires are burning beneath the surface around the world.
Go to the WUKY website to listen to this coal fires story