( ( ( ( The burning ) ( of ( fossil fuels ) ) ) ( -LRB- ( ( ( ( ( ( ( ( ( gasoline , ) ( heating oil ) ) , ) kerosene ) , ) ( natural gas ) ) and ) coal ) -RRB- ) ) ) ( ( produces ( ( ( the ( gas ( carbon dioxide ) ) ) ( -LRB- ( CO2 -RRB- ) ) ) ( as ( a by-product ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NN burning)) (PP (IN of) (NP (JJ fossil) (NNS fuels)))) (PRN (-LRB- -LRB-) (NP (NP (NN gasoline)) (, ,) (NP (NN heating) (NN oil)) (, ,) (NP (NN kerosene)) (, ,) (NP (JJ natural) (NN gas)) (CC and) (NP (NN coal))) (-RRB- -RRB-))) (VP (VBZ produces) (NP (NP (NP (DT the) (NN gas) (NN carbon) (NN dioxide)) (PRN (-LRB- -LRB-) (NP (NNP CO2)) (-RRB- -RRB-))) (PP (IN as) (NP (DT a) (NN by-product))))) (. .)))
The burning of fossil fuels (gasoline, heating oil, kerosene, natural gas and coal) produces the gas carbon dioxide (CO2) as a by-product.
(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))))))))) (. .)))