The common green house gases are `CO_(2),CH_(4)`, CFC, oxide of nitrogen `(N_(2)O)`, water vapour and `O_(3)`. The level of `CO_(2)` (green house gas) is increasing due to large scale deforestation, change in land use and unlimited buring of fossils fuel and is leading to global warming. The source of methane and other main green house gases are garbage dump, incomplete decomposition by anaerobic methanogens, flooded paddy field and marshy land. About `90-95%` of `CH_(4)` is produced/generated by rice fields of Asia.
