Naturally emerging in coal mine gas methane (chemically CO4) as compared with carbon dioxide (chemically CO2) contains a 23 times higher potential relevant for the Greenhouse Effect.

• 矿井瓦斯中天然形成的甲烷(化学名称CH4)与二氧化碳(化学名称CO2)相比,形成温室效应的潜力高23倍。