Related by context. Frequent words. (Click for all words.) 78 hydrofracking 73 fracking 67 Fracking 66 hydraulic fracturing 58 Marcellus Shale formation 57 Marcellus shale 55 Marcellus Shale 53 shale 53 drilling 52 horizontal drilling 52 drillers 52 shale gas 49 tar sands 48 groundwater contamination 48 Marcellus 47 shale formations 47 coalbed methane 46 NYRI 46 natural gas 46 bed methane 46 mountaintop mining 45 mountaintop removal 45 Gas Drilling 45 wells 45 shale deposits 45 coal seam 45 coal seams 45 DEP 44 Gasland 44 exploratory drilling 44 mountaintop removal mining 44 extraction 44 coal seam gas 44 offshore drilling 44 Environmental Conservation 43 groundwater 43 frac 43 MTBE 43 Barnett Shale 43 oil sands 43 methane 43 directional drilling 43 oilsands 42 uranium mining 42 aquifers 42 contaminated groundwater 42 Shale 42 aquifer 42 sludge 42 shales 42 wells drilled 42 Roan Plateau 41 mountaintop removal coal 41 drilling fluids 41 wastewater discharge 41 horizontal wells 41 environmentally sensitive 41 extractive 41 leaching 41 perc 41 coal ash 40 carbon sequestration 40 dewatering 40 timber harvesting 40 deepwater drilling 40 watersheds 40 coal gasification 40 BOEMRE 40 biosolids 40 mineral extraction 40 coal mining 39 tritium 39 Haynesville Shale 39 Environmental Protection DEP 39 Drilling 39 environmentalists 39 gasification 39 EOG Resources 39 underground 39 Avella 39 outer continental shelf 39 EOR 38 subsurface 38 wastewater 38 environmentally destructive 38 mine tailings 38 hydrocarbon 38 environmentally harmful 38 EOG Resources Inc. 38 sewage sludge 38 compressor stations 38 gravel pits 38 contaminated soil 38 Athabasca River 38 brine 38 Safe Drinking Water 38 Appalachian Basin 38 geological formations 38 Fayetteville Shale 38 waste disposal 38 environmentally damaging