Related by context. Frequent words. (Click for all words.) 85 hydraulic fracturing 58 drillers 57 Marcellus Shale 57 shale gas 56 shale 55 horizontal drilling 54 tar sands 52 coalbed methane 51 oilsands 50 drilling 49 oil sands 48 mountaintop removal 48 Marcellus 48 bed methane 48 groundwater contamination 47 offshore drilling 46 groundwater 46 coal ash 46 aquifers 46 coal seam gas 45 deepwater drilling 45 Barnett Shale 44 natural gas 44 dispersants 44 MTBE 43 biosolids 42 sludge 42 brine 42 uranium mining 42 methane 42 frac 42 aquifer 41 Haynesville Shale 41 wells 41 watersheds 41 carbon sequestration 41 wastewater 41 exploratory drilling 40 mercury pollution 40 coal gasification 40 PFOA 40 Range Resources 39 dispersant 39 coal mining 39 Groundwater 39 Encana 39 mining 38 carcinogens 38 fluoride 38 methane gas 38 Environmental Conservation 38 Trout Unlimited 37 contaminants 37 carbon capture 37 wells drilled 37 extraction 37 ANWR 37 hydrogen sulfide 37 toxic chemicals 37 TCEQ 37 pollute 37 horizontal wells 37 Powder River Basin 37 fluoridation 37 Outer Continental Shelf 37 spill 37 coal 37 environmentalists 37 leaching 37 tritium 36 carcinogen 36 Macondo 36 subsurface 36 mercury emissions 36 incinerators 36 bisphenol 36 chemical dispersants 36 Chesapeake Energy 36 blowout preventer 36 wellhead 36 septic tanks 36 Methane 36 septic systems 36 reservoirs 36 Clean Water Act 36 Shale 36 EPA 36 Drilling 36 hydrocarbons 36 DEQ 35 DEP 35 wind farms 35 Superfund site 35 GMOs 35 coal mines 35 pollutant 35 contaminate 35 spills 35 EnCana 35 Deepwater Horizon 35 environmental