This ultimately reduces the methane saturation of the coal bed and increases {HEAD ~ the capacity} of {TAIL ~ the coal bed} for hydrogen storage 
This ultimately reduces the methane saturation of the coal bed and increases { HEAD ~ the capacity } of { TAIL ~ the coal bed } for hydrogen storage
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH