Carbon dioxide (CO_2) sequestration in coal and enhanced coalbed methane recovery (ECBM) during injection of carbon dioxide have recently become a vibrant research area due to its potential for permanently storing carbon dioxide in deep and unminable coal seams while producing methane to offset the costs. The field applications of this technology have been demonstrated in North America, Asia and Europe in medium- to large-scale field tests. Future smaller scale demonstration tests are also being planned in different countries to further explore the potential of the technology to reduce atmospheric CO_2 levels and to investigate various operational problems and unexpected outcomes that have been encountered in the previous field tests.
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