( ( ( Carbon Dioxide ) ( as ( a ( Greenhouse Gas ) ) ) ) ( ( After ( water vapor ) ) ( , ( ( carbon dioxide ) ( ( is ( the ( ( most important ) ( greenhouse gas ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (NNP Carbon) (NNP Dioxide)) (PP (IN as) (NP (DT a) (NNP Greenhouse) (NNP Gas)))) (PP (IN After) (NP (NN water) (NN vapor))) (, ,) (NP (NN carbon) (NN dioxide)) (VP (VBZ is) (NP (DT the) (ADJP (RBS most) (JJ important)) (NN greenhouse) (NN gas))) (. .)))
Carbon Dioxide as a Greenhouse Gas After water vapor, carbon dioxide is the most important greenhouse gas.
(ROOT (S (NP (NP (DT The) (NN combustion)) (PP (IN of) (NP (NN propane) (NN gas)))) (VP (VBZ produces) (NP (NP (NN carbon) (NN dioxide)) (CC and) (NP (NN water) (NN vapor)))) (. .)))