Related by context. Frequent words. (Click for all words.) 85 fracking 61 horizontal drilling 59 Marcellus Shale 58 shale 58 drillers 57 Marcellus shale 56 shale gas 55 coalbed methane 54 drilling 49 tar sands 49 Marcellus 49 oil sands 49 bed methane 48 frac 48 deepwater drilling 47 natural gas 47 offshore drilling 46 wellbore 46 dispersants 46 Barnett Shale 45 oilsands 44 coal seam gas 44 wells 44 Fayetteville Shale 44 Range Resources 44 coal seam 44 coal seams 44 MTBE 44 Haynesville Shale 44 groundwater contamination 43 hydrocarbons 43 horizontal wells 43 dispersant 43 wells drilled 43 groundwater 42 exploratory drilling 42 mountaintop removal 42 hydrocarbon 41 aquifers 41 extraction 41 coal ash 41 methane 41 biosolids 40 Appalachian Basin 40 carbon sequestration 40 chemical dispersants 40 PFOA 40 North Slope 40 coal gasification 40 EnCana 39 subsurface 39 Deepwater Horizon disaster 39 pretexting 39 ANWR 39 drilling rigs 39 contaminants 39 blowout preventer 39 Encana 39 Safe Drinking Water 39 static kill 39 drilling rig 39 coal mining 39 Macondo 39 wellhead 38 sewage sludge 38 Alberta oilsands 38 Outer Continental Shelf 38 fracturing 38 sludge 38 Environmental Conservation 38 oil 38 toxic chemicals 38 deepwater 38 wastewater 38 uranium mining 38 environmentally sensitive 37 EOG 37 aquifer 37 leachate 37 driller 37 Drilling 37 atrazine 37 Powder River Basin 37 liquids 37 rig explosion 37 dewatering 37 bisphenol 37 methane gas 37 Montney 37 brine 37 Deepwater Horizon 37 TransCanada 37 Chesapeake Energy 37 XTO 37 gas 37 nanomaterials 36 offshore rigs 36 combustion 36 EPA 36 enhanced interrogation techniques 36 TCEQ