( ( ( ( ( ( ( Large amounts ) ( of methane ) ) ( are ( produced ( during ( industrial ( sewage ( treatment processes ) ) ) ) ) ) ) , ) but ) ( ( the gas ) ( ( is usually ) ( ( ( wasted ( rather than ) ) trapped ) ( for recycling ) ) ) ) ) . )
(ROOT (S (S (NP (NP (JJ Large) (NNS amounts)) (PP (IN of) (NP (NN methane)))) (VP (VBP are) (VP (VBN produced) (PP (IN during) (NP (JJ industrial) (NN sewage) (NN treatment) (NNS processes)))))) (, ,) (CC but) (S (NP (DT the) (NN gas)) (VP (VBZ is) (ADVP (RB usually)) (VP (VP (VBN wasted)) (CONJP (RB rather) (IN than)) (VP (VBN trapped)) (PP (IN for) (NP (NN recycling)))))) (. .)))
Large amounts of methane are produced during industrial sewage treatment processes, but the gas is usually wasted rather than trapped for recycling.
(ROOT (S (NP (NNS Archaeans)) (VP (VBP produce) (NP (NN methane) (NN gas)) (PP (IN as) (NP (DT a) (NN waste) (NN product)))) (. .)))