[rch]

You can also pump CO2 into deep coal seams, displacing CH4 which is then burned in a closed capture system. The CO2 released from burning the CH4 is also sequestered resulting in a net gain since CO2 preferentially adsorbs to coal at a roughly 3:1 ratio to CH4. Economically viable coal seams are widespread globally, and exist within 50 km of most coal burning power plants in the United States.