The most commonly applied UCG designs are Linked Vertical Wells (LVW) and Controlled Retracting Injection Point (CRIP). In the CRIP process, the production well is drilled vertically, and the injector is drilled horizontally close enough to the producer to have considerable flow connection. When the linking channel is established, the coal is ignited at the end of the horizontal well and a cavity is initiated. A main problem with UCG in contrast to other fossil fuel technologies is the higher CO2 production which may lead to a global warming potential. Potential solutions for this problem may be compression and injection of the recovered CO2 into an exhausted UCG reactor or into a seam in which the permeability has been enhanced by the relaxation of the strata overlying the reactor for the purposes of CO2 sequestration.