When leftover materials in Pennsylvania's coal mines catch fire, they can sometimes take decades to burn out. The fire underneath Boyce Park has been burning since the late 1980s.

Steve Jones is director of the state's department of mine hazards. He says the fire hasn't caused much damage so far, but adds that doesn't mean it's a good idea to let it burn.

We have park buildings and facilities that the carbon monoxide could seep into, it's a real health risk. Power lines and water lines and things like that could be disrupted by the subsidence. Here's this great opportunity to get in and catch this acres when it's 4 acres in size. We might not be that lucky 20 years from now. It could be much larger.

Jones says it'll take about a year to excavate the burning material, cool it off, and return the park to its former condition. An earlier fire in Boyce Park had burned for twenty years by the time it was put out in 1979. More information's available on the web at GreenWorks.tv. I'm Brad Linder.