Related by context. Frequent words. (Click for all words.) 46 methane 44 fires prompts evacuations 42 contaminating groundwater 41 manmade greenhouse gases 41 noxious gases 41 decomposing garbage 41 combustible gases 40 deplete oxygen 40 Bill Caylor 40 seepage 40 highly combustible methane 40 fracking 40 poisonous carbon monoxide 40 Suboleski 39 methane hydrates 39 fracturing fluids 39 ventilation 39 AP Interview Schieffer 39 de Sabinas 39 incomplete combustion 39 Jeff Gillenwater 39 vents methane 39 faulty furnace 39 Drengenberg 39 MSHA 39 methane gas 39 nitrogen trifluoride 39 naturally occurring radioactive 39 fracking fluids 38 Zasyadko mine 38 vapors 38 drillers 38 noxious odors 38 contaminate drinking 38 flammable vapors 38 mountaintop mines 38 Sulfur dioxide 38 See Futures Movers 38 spokeswoman Amy Louviere 38 corrosives 38 fracking fluid 38 putrid smell 38 regulates offshore drilling 38 seeps 38 explosion 38 natural gas 37 mercaptan 37 overpressure 37 cave ins 37 W.Va. mine 37 seismic activity 37 No.2 reactor 37 gases 37 Coal seam 37 odorant 37 Massey 37 feedwater 37 Tar sands 37 propane leak 36 wastewater discharges 36 injecting nitrogen 36 sewage backups 36 flammable vapor 36 radiant heating 36 unpleasant smell 36 longwall mining 36 faulty heater 36 gasified 36 overfilled 36 Chief Executive Don Blankenship 36 MSHA inspectors 36 John Bresland 36 unvented 36 inadequate 36 Marcellus Shale formation 36 propane tank exploded 36 rotten egg smell 36 Benjamin H. Grumbles 36 Mr Whittall 36 sheer enormity 36 carbon dioxide methane 36 carbon monoxide 36 noxious chemicals 36 carbonic acid 36 chemical solvents 36 desorption 36 unpleasant odors 36 fracking chemicals 36 leak 36 Luke Popovich 35 contaminate groundwater 35 reinjection 35 combustibility 35 Massey Aracoma Alma 35 Gene Kitts 35 hydrogen sulfide 35 magma chamber 35 contaminants 35 Trapped miners 35 dryer vents 35 COGCC