Protest at Pennsylvania governor's inauguration against hydraulic fracturing in oil and gas industry

Fracking is short for hydraulic fracturing, a process used to increase the flow of oil and gas from underground wells. According to this article about the controversy over fracking, incoming Governor Tom Corbett is seen as friendlier to the gas industry than outgoing governor Ed Rendell. Here's some more info about the Marcellus Shale rock formation, where the drilling is taking place.