Finding affordable and abundant sources of domestic energy has become a big priority in recent years. And while many options are being looked at, one that has taken the nation by storm is the development of shale gas. In places like North Dakota and Pennsylvania numerous drilling operations are setting up shop, driving down unemployment and creating an economic boom. And this is likely to only get bigger, as a recent study by the U.S. Geological Survey found there is a whopping 84 trillion cubic feet of discoverable natural gas in the Marcellus shale region of the Appalachian mountains alone. With competitors like China also moving to tap their reserves, it looks like shale exploration is getting many energy providers all gassed up.