( ( ( ( ( Methane Production ) , ) ( ( ( detailed discussion ) ( by someone ) ) ( who ( 's ( ( done it ) ( -LRB- ( that is ) ) ) ) ) ) ) , ) ( ( ( produced ( methane gas ) ) ( from ( ( ( manure and ) chopped ) ( plant matter ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Methane) (NNP Production)) (, ,) (NP (NP (VBN detailed) (NN discussion)) (PP (IN by) (NP (NN someone))) (SBAR (WHNP (WP who)) (S (VP (VBZ 's) (VP (VBN done) (NP (PRP it)) (SBAR (S (-LRB- -LRB-) (NP (DT that)) (VP (VBZ is))))))))) (, ,)) (VP (VBD produced) (NP (NN methane) (NN gas)) (PP (IN from) (NP (ADJP (JJ manure) (CC and) (JJ chopped)) (NN plant) (NN matter)))) (. .)))
Methane Production , detailed discussion by someone who's done it (that is, produced methane gas from manure and chopped plant matter.
(ROOT (S (NP (NNS Archaeans)) (VP (VBP produce) (NP (NN methane) (NN gas)) (PP (IN as) (NP (DT a) (NN waste) (NN product)))) (. .)))