( ( Carbon dioxide ) ( ( is ( produced ( by ( ( many reactions ) ( including ( ( the reduction ) ( of ( nitrate ( to ( nitrogen gas ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Carbon) (NN dioxide)) (VP (VBZ is) (VP (VBN produced) (PP (IN by) (NP (NP (JJ many) (NNS reactions)) (PP (VBG including) (NP (NP (DT the) (NN reduction)) (PP (IN of) (NP (NP (NN nitrate)) (PP (TO to) (NP (NN nitrogen) (NN gas))))))))))) (. .)))
Carbon dioxide is produced by many reactions including the reduction of nitrate to nitrogen gas.
(ROOT (S (NP (NNP Combustion) (NNS reactions)) (VP (VBP involve) (S (NP (NP (DT the) (NN reaction)) (PP (IN of) (NP (NP (DT a) (NN hydrocarbon)) (PP (IN with) (NP (NN oxygen) (NN gas)))))) (VP (TO to) (VP (VB produce) (NP (NN water) (CC and) (NN carbon) (NN dioxide)))))) (. .)))