Related by context. Frequent words. (Click for all words.) 66 hydraulic fracturing 63 Fracking 60 fracking 56 fracing 55 shale formations 53 hydrofracking 53 horizontal drilling 52 shale 48 shale deposits 48 Marcellus Shale formation 47 coal seam 46 EOR 46 directional drilling 46 frack 45 coal seams 45 drillers 44 proppant 44 flowback 44 contaminate drinking 44 shale gas 44 contaminate groundwater 43 geologic formations 43 wellbore 43 bed methane 43 drilling fluids 43 categorical exclusions 42 tar sands 42 Marcellus shale 42 Ammonia 42 extraction 42 shales 42 coalbed methane 42 Fayetteville Shale 41 deepwater wells 41 Fischer Tropsch 41 Sulfur dioxide 41 drilling 41 Marcellus Shale 41 Natural gas 41 hydrofluoric acid 41 oil sands 41 lignite coal 41 SAGD 40 Barnett Shale 40 subsurface 40 Shale 40 Carbon dioxide 40 NYSE RRC 40 natural gas 39 Methane 39 extractive 39 coal slurry 39 downhole 39 coal gasification 39 mountaintop removal 39 Bakken formation 39 cruel inhumane 39 underground aquifers 39 Atrazine 39 BP Macondo 39 bioremediation 39 extractable 39 frac 39 methane 39 geological formations 39 underground aquifer 39 perchlorethylene 38 fracture stimulated 38 heap leaching 38 mountaintop removal mining 38 Waterboarding 38 outer continental shelf 38 Arkoma Basin 38 Marcellus Shale Coalition 38 horizontal wells 38 hydrocarbon 38 Alberta tar sands 38 hydrocarbons 38 Woodford Shale 37 intact dilation 37 gasoline additive MTBE 37 Bakken Shale 37 offshore drilling 37 Haynesville Shale 37 fracture stimulation 37 wellhead 37 carbon sequestration 37 ANWR 37 gas hydrates 37 situ 37 longwall mining 37 environmentally damaging 37 Drilling 36 COGCC 36 Sago mine disaster 36 dispersants 36 mountaintop mining 36 gasoline additive 36 wells 36 thousand cubic feet 36 Gas Drilling