On a recent visit to Pennsylvania, I saw signs of a natural gas boom on the wane.

Googling “Pennsylvania ‘natural gas rush’” this morning got me 356,000 hits. Some may call it a gas boom instead of a rush, but, regardless, it seems to be a happening thing.

The development of the technology that combines horizontal drilling with hydraulic fracturing (or fracking) along with the trillions of cubic feet of natural gas that lie in the Marcellus shale formations (from less than 2,000 feet to more than 11,000 feet [pdf] beneath the surface) has lured the gas industry to the Keystone State.

A New Energy Ball Game for the Nation

That “fracking” rush, along with similar ones in