and some current developments:
Coalbed methane (CBM) – also known in Australia as coal seam gas (CSG) -- natural gas that is stored (‘adsorbed”) in deeply buried coal seams. CBM is pipeline-quality gas that requires no or minimal processing prior to sale. 
What the picture doesn’t show is the thousands of methane vents coming from those deposits and naturally occurring methane from decomposition in the earth and at the surface. What the article misses is we in the oil and gas business vent very little methane, to vent means losing money and we don’t like doing that. The gas produced goes directly into pipelines.