The gas released during anaerobic degradation of vegetation may lead to:

Biogas is the mixtrue of gases produced by the breakdown of organic matter in the absence of oxygen (anaerobically), primary consisting of methane and carbondioxide. Biogas can be produced from raw material such as agricultural waste, manure, municiple waste, plant material, sewage, green waste or good waste. Due to release of $\mathrm{CH}_{4}$ gas during anaerobic vegetative degradstion which caueses globle warming and cancer.