The documentary Gasland is all about hydraulic fracturing to obtain natural gas, and the discussions (arguments) I've heard about it tend to be completely predictable.  If a person doesn't support fracking, they say, "Pumping harsh chemicals into our ground water causes cancer."  If a person supports fracking, they go with, "It creates jobs and reduces our dependency on foreign oil."  Both points are probably correct, which is why no argument about this topic is ever fruitful.