PA governor announced yesterday that the State intends to implement more stringent environmental regulation of gas drilling.  Marcellus Shale "fracking" procedures have raised substantial controversy over the last few months.  Residents and environmentalists claim contamination of groundwater, while gas companies claim it's the same procedures with the same and adequate protection as they have always used.  As this issue gathers political traction it will become harder to achieve a balance based solely on science.  The irony here is that natural gas is generally considered a "clean" fossil fuel in terms of the Greenhouse Gas/Climate Change debate.