( ( ( ( ( Human activities ) , ) ( such ( as ( ( the burning ) ( of ( ( fossil ( ( fuels and ) changes ) ) ( in ( land use ) ) ) ) ) ) ) ) , ) ( ( ( ( release ( ( large amounts ) ( of CO2 ) ) ) , ) ( ( causing concentrations ) ( in ( the ( atmosphere ( to rise ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Human) (NNS activities)) (, ,) (PP (JJ such) (IN as) (NP (NP (DT the) (NN burning)) (PP (IN of) (NP (NP (JJ fossil) (NNS fuels) (CC and) (NNS changes)) (PP (IN in) (NP (NN land) (NN use))))))) (, ,)) (VP (VBP release) (NP (NP (JJ large) (NNS amounts)) (PP (IN of) (NP (NNP CO2)))) (, ,) (S (VP (VBG causing) (NP (NNS concentrations)) (PP (IN in) (NP (DT the) (NN atmosphere) (S (VP (TO to) (VP (VB rise))))))))) (. .)))
Human activities, such as the burning of fossil fuels and changes in land use, release large amounts of CO2, causing concentrations in the atmosphere to rise.
(ROOT (S (NP (JJ Co2) (NN gas)) (VP (VBZ is) (VP (VBN released) (PP (IN into) (NP (NP (DT the) (NN atmosphere)) (SBAR (WHADVP (WRB when)) (S (NP (JJ fossil) (NNS fuels)) (VP (VBP are) (VP (VBN burned))))))))) (. .)))