Related by context. Frequent words. (Click for all words.) 41 hydraulic fracturing 38 fracking 32 drillers 29 extraction 28 drilling fluids 27 Marcellus 26 horizontal drilling 26 bed methane 26 shale 26 DEP 25 Cabot Oil 25 Marcellus Shale 25 Marcellus shale 25 sludge 24 Environmental Conservation 24 wells 24 drilling 24 subsurface 24 Deepwater Horizon explosion 24 XTO 23 Chesapeake Energy 23 ANWR 23 coal tar 23 Range Resources 23 oil 23 frac 23 Barnett Shale 23 pollute 23 directional drilling 23 DeGette 22 fracturing 22 gas 22 hydrocarbons 22 shale gas 22 brine 22 contaminate 22 wellbore 22 groundwater contamination 22 Safe Drinking Water 22 methane 21 MTBE 21 shale formations 21 tar sands 21 dispersants 21 leaching 20 EPA 20 dewatering 20 Encana 20 gasoline additive 20 DEQ 20 driller 20 coal seam 19 North Slope 19 seismic surveys 19 TCEQ 19 hydrocarbon 19 environmentally damaging 19 shales 19 fracture stimulation 19 wells drilled 19 dispersant 18 hydrogen sulfide 18 Fayetteville Shale 18 liquids 18 natural gas 18 EOR 18 leachate 18 combustion 18 Deepwater Horizon disaster 18 horizontal wells 18 blowout preventers 18 groundwater 18 pasteurization 18 carcinogen 18 EOG Resources 17 spills 17 wastewater 17 sewage sludge 17 contaminated groundwater 17 Macondo 17 Haynesville Shale 17 coalbed methane 17 EnCana 16 methane gas 16 Corexit 16 outer continental shelf 16 EOG 16 oil sands 16 CNX Gas 16 blowout preventer 16 drilling rigs 16 Outer Continental Shelf 15 chemical dispersants 15 carcinogens 15 offshore rigs 15 toxic chemicals 15 Sludge 15 wellhead 15 offshore drilling 15 contaminants 15 hydrates