Concentration of greenhouse gases, especially CO2, have increased substantially since the beginning of the industrial revolution.
( ( ( ( ( Concentration ( of ( greenhouse gases ) ) ) , ) ( especially CO2 ) ) , ) ( ( have ( ( increased substantially ) ( since ( ( the beginning ) ( of ( the ( industrial revolution ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Concentration)) (PP (IN of) (NP (NN greenhouse) (NNS gases))) (, ,) (ADJP (RB especially) (JJ CO2)) (, ,)) (VP (VBP have) (VP (VBN increased) (ADVP (RB substantially)) (PP (IN since) (NP (NP (DT the) (NN beginning)) (PP (IN of) (NP (DT the) (JJ industrial) (NN revolution))))))) (. .)))
Greenhouse gases have increased because of the industrial revolution.
( ( Greenhouse gases ) ( ( have ( increased ( because ( of ( the ( industrial revolution ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Greenhouse) (NNS gases)) (VP (VBP have) (VP (VBN increased) (PP (RB because) (IN of) (NP (DT the) (JJ industrial) (NN revolution))))) (. .)))