-This paper describes pollution of coalbed methane to atmosphere and the greenhouse effect. Calculation Showed that the annually discharged volume of coalbed methane to the air in China amounted to 5.95 per cent of the total discharged volume of greenhouse gases in the world, and utilizing the adsorption feature of coal can realize the drainage, purification and concentration of coalbed methane. However, some problems still exist in the application of PSA technique for the concentration and purification ...