The most difficult investigation piece our energyNOW! team has ever attempted. The subject of “fracking,” a catch-all term for producing natural gas from shale rock, may be the most controversial energy topic in America right now. Who doesn’t love the idea of an abundant energy source found right here in the US? The answer: everyone who’s concerned about the potential environmental effects of getting that energy out of the ground. We talked with landowners and regulators, doctors and engineers, advocates and agnostics about the controversy. The resulting story, essentially our entire half-hour program this particular week, took us deep into the heart of the massive Marcellus Shale.