( CO2 ( ( ( is also ) ( naturally ( ( occurring ( but ( ( ( because ( of ( ( solid ( ( waste and ) burning ) ) ( of ( fossil fuels ) ) ) ) ) and ) ( wood products ) ) ) ) ( much ( more ( CO2 ( is ( being ( released ( into ( the atmosphere ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP CO2)) (VP (VBZ is) (ADVP (RB also)) (VP (ADVP (RB naturally)) (VBG occurring) (PP (CC but) (IN because) (PP (IN of) (NP (NP (JJ solid) (NN waste) (CC and) (NN burning)) (PP (IN of) (NP (JJ fossil) (NNS fuels))))) (CC and) (NP (NN wood) (NNS products))) (S (ADJP (RB much) (RBR more) (SBAR (S (NP (NNP CO2)) (VP (VBZ is) (VP (VBG being) (VP (VBN released) (PP (IN into) (NP (DT the) (NN atmosphere)))))))))))) (. .)))
CO2 is also naturally occurring but because of solid waste and burning of fossil fuels and wood products much more CO2 is being released into the atmosphere.
(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))))))))) (. .)))