( ( Even ( as ( ( ( the amount ) ( of ( ( carbon dioxide ) ( in ( the atmosphere ) ) ) ) ) ( has grown ) ) ) ) ( , ( there ( still ( ( ( ( is n't ) ( as much ) ) ( ( up there ) ( as ( scientists ( say ( there ( should be ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (RB Even) (IN as) (S (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN carbon) (NN dioxide)) (PP (IN in) (NP (DT the) (NN atmosphere)))))) (VP (VBZ has) (VP (VBN grown))))) (, ,) (NP (EX there)) (ADVP (RB still)) (VP (VBZ is) (RB n't) (ADJP (RB as) (JJ much)) (SBAR (ADVP (RB up) (RB there)) (IN as) (S (NP (NNS scientists)) (VP (VBP say) (SBAR (S (NP (EX there)) (VP (MD should) (VP (VB be))))))))) (. .)))
Even as the amount of carbon dioxide in the atmosphere has grown, there still isn't as much up there as scientists say there should be.
(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))))) (. .)))