( ( ( ( ( ( These fuels ) ( contain ( ( large amounts ) ( of carbon ) ) ) ) , ) and ) ( ( when ( they ( are burned ) ) ) ( , ( ( much ( of ( that carbon ) ) ) ( is ( released ( into ( ( the atmosphere ) ( in ( ( the form ) ( of ( ( ( carbon dioxide ) and ) ( other gasses ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT These) (NNS fuels)) (VP (VBP contain) (NP (NP (JJ large) (NNS amounts)) (PP (IN of) (NP (NN carbon)))))) (, ,) (CC and) (S (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP are) (VP (VBN burned))))) (, ,) (NP (NP (RB much)) (PP (IN of) (NP (DT that) (NN carbon)))) (VP (VBZ is) (VP (VBN released) (PP (IN into) (NP (NP (DT the) (NN atmosphere)) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NP (NN carbon) (NN dioxide)) (CC and) (NP (JJ other) (NNS gasses))))))))))) (. .)))
These fuels contain large amounts of carbon, and when they are burned, much of that carbon is released into the atmosphere in the form of carbon dioxide and other gasses.
(ROOT (S (PP (IN During) (NP (DT the) (JJ early) (NN paleozoic))) (, ,) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN carbon) (NN dioxide)) (PP (IN in) (NP (DT the) (NN atmosphere)))))) (VP (VBD was) (ADJP (RB much) (JJR greater)) (PP (VBN compared) (PP (TO to) (NP (NN today))))) (. .)))