Related by context. Frequent words. (Click for all words.) 66 hydraulic fracturing 65 hydrofracking 65 fracking 59 Fracking 55 fracing 55 Hydraulic fracturing 53 shale 53 horizontal drilling 52 coalbed methane 52 shale formations 51 contaminate groundwater 51 shale gas 50 drilling 50 drillers 49 Marcellus Shale drilling 49 shale deposits 49 tar sands 49 pollute groundwater 48 natural gas 48 Marcellus Shale formation 48 contaminate drinking 47 coal seam gas 47 bed methane 47 frack 47 extraction 47 Alberta tar sands 46 COGCC 46 oil 45 offshore drilling 45 methane hydrates 45 gas 44 oil sands 44 hydrocarbons 44 shales 44 MTBE 44 unconventional shale 44 coal seams 44 exploratory drilling 44 Marcellus shale 43 aquifers 43 ANWR 43 hydrocarbon 43 outer continental shelf 43 Arctic Refuge 43 Roan Plateau 43 directional drilling 43 wells 43 Marcellus Shale 43 groundwater 43 drilling fluids 43 EOR 43 dispersants 43 Otero Mesa 42 biogenic 42 Gasland 42 mountaintop mining 42 Marcellus 42 Tar Sands 42 geologic formations 42 Ogallala Aquifer 42 BOEMRE 42 categorical exclusions 42 carbon sequestration 42 gasoline additive MTBE 41 underground aquifers 41 longwall mining 41 Biodiversity Conservation Alliance 41 methane 41 Barnett shale 41 flowback 41 oilsands 41 Fracturing 41 dissolved solids 41 Shale 41 gas hydrates 41 fracs 41 hydrofluoric acid 41 Barnett Shale 41 Shale Gas 41 groundwater contamination 41 oyster harvesting 41 petroleum 41 Atrazine 40 Surat Basin 40 Bradwood Landing 40 finite resource 40 sage grouse habitat 40 offshore drilling moratorium 40 subsurface 40 SNWA 40 dispersant 40 coal slurry 40 Utica Shale 40 mountaintop removal 40 chloramine 40 Bakken Formation 40 Pinedale Anticline 40 coal seam 40 environmentally sensitive 40 aquifer 40 coalbed methane CBM