( ( Rain forests ) ( ( ( ( ( absorb ( ( great amounts ) ( of ( carbon dioxide ) ) ) ) ( from ( the atmosphere ) ) ) and ) ( can ( help ( reduce ( global warming ) ) ) ) ) . ) )
(ROOT (S (NP (NN Rain) (NNS forests)) (VP (VP (VBP absorb) (NP (NP (JJ great) (NNS amounts)) (PP (IN of) (NP (NN carbon) (NN dioxide)))) (PP (IN from) (NP (DT the) (NN atmosphere)))) (CC and) (VP (MD can) (VP (VB help) (VP (VB reduce) (NP (JJ global) (NN warming)))))) (. .)))
Rain forests absorb great amounts of carbon dioxide from the atmosphere and can help reduce global warming.
(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))))) (. .)))