Reply #1: Engelder made unsubstantiated claims until proven wrong.

[Divernan]

This guy ignores his scientific training and loses his objectivity when his financial interests are at stake. The term "hired gun" comes to mind.

"Additionally, Engelder and industry sources have charged that gas will not migrate from the Marcellus to the surface, but a U.S. Geological Survey study in Tioga County, Pa., showed that gas migrated from below the Marcellus to the surface. Because of this, gas can compromise groundwater and can explode.
After the interview, Engelder contacted Voices to say he had followed up on that study and that indeed the conclusion was that the gas did migrate, though researchers did not investigate how."
http://voicesweb.org/risks-marcellus-shale-drilling-are...