( Methane ( ( is ( ( produced ( through ( ( anaerobic ( ( -LRB- ( ( without oxygen ) -RRB- ) ) decomposition ) ) ( of waste ) ) ) ) ( in ( ( ( ( ( ( landfills , ) ( animal digestion ) ) , ) ( decomposition ( of ( animal wastes ) ) ) ) , ) ( ( ( production and ) distribution ) ( of ( ( ( natural ( gas ( , ( oil ( and ( coal production ) ) ) ) ) ) and ) ( incomplete ( fossil ( fuel combustion ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Methane)) (VP (VBZ is) (VP (VBN produced) (PP (IN through) (NP (NP (JJ anaerobic) (PRN (-LRB- -LRB-) (PP (IN without) (NP (NN oxygen))) (-RRB- -RRB-)) (NN decomposition)) (PP (IN of) (NP (NN waste))))) (PP (IN in) (NP (NP (NNS landfills)) (, ,) (NP (NN animal) (NN digestion)) (, ,) (NP (NP (NN decomposition)) (PP (IN of) (NP (NN animal) (NNS wastes)))) (, ,) (NP (NP (NN production) (CC and) (NN distribution)) (PP (IN of) (NP (NP (JJ natural) (NN gas) (, ,) (NN oil) (CC and) (NN coal) (NN production)) (CC and) (NP (JJ incomplete) (JJ fossil) (NN fuel) (NN combustion))))))))) (. .)))
Methane is produced through anaerobic (without oxygen) decomposition of waste in landfills, animal digestion, decomposition of animal wastes, production and distribution of natural gas, oil and coal production and incomplete fossil fuel combustion.
(ROOT (S (NP (NNS Archaeans)) (VP (VBP produce) (NP (NN methane) (NN gas)) (PP (IN as) (NP (DT a) (NN waste) (NN product)))) (. .)))