Coalfires, both underground and on the surface, are a serious problem in most major coal-producing countries of the Asia-Pacific region including China, India and Indonesia. Australia also experiences similar problems but on a somewhat smaller scale. Coal fires produce large quantities of CO2 along with several other noxious gases such as carbon monoxide, oxides of sulphur and methane. It has been noted that greenhouse gas emissions from coalfires are significant enough to create a global impact.