( ( ( ( ( ( Burning ( fossil fuels ) ) ( releases ( ( ( carbon dioxide ) ( -LRB- ( CO2 -RRB- ) ) ) ( to ( the atmosphere ) ) ) ) ) , ) but ) ( ( ( ( any ( single ( company 's ) ) ) contribution ) ( to ( the aggregate ) ) ) ( is ( practically undetectable ) ) ) ) . )
(ROOT (S (S (NP (NN Burning) (NN fossil) (NNS fuels)) (VP (VBZ releases) (NP (NP (NP (NN carbon) (NN dioxide)) (PRN (-LRB- -LRB-) (NP (NNP CO2)) (-RRB- -RRB-))) (PP (TO to) (NP (DT the) (NN atmosphere)))))) (, ,) (CC but) (S (NP (NP (NP (DT any) (JJ single) (NN company) (POS 's)) (NN contribution)) (PP (TO to) (NP (DT the) (NN aggregate)))) (VP (VBZ is) (ADJP (RB practically) (JJ undetectable)))) (. .)))
Burning fossil fuels releases carbon dioxide (CO2) to the atmosphere, but any single company's contribution to the aggregate is practically undetectable.
(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))))))))) (. .)))