( ( ( ( ( ( These numbers ) ( are ( ( large enough ) ( to ( ( warrant ( serious attention ) ) ( by environmentalists ) ) ) ) ) ) , ) and ) ( ( no one ) ( disagrees ( that ( ( ( cleaning up ) ( auto emissions ) ) ( would ( help ( improve ( urban ( air quality ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT These) (NNS numbers)) (VP (VBP are) (ADJP (JJ large) (RB enough) (S (VP (TO to) (VP (VB warrant) (NP (JJ serious) (NN attention)) (PP (IN by) (NP (NNS environmentalists))))))))) (, ,) (CC and) (S (NP (DT no) (NN one)) (VP (VBZ disagrees) (SBAR (IN that) (S (S (VP (VBG cleaning) (PRT (RP up)) (NP (NN auto) (NNS emissions)))) (VP (MD would) (VP (VB help) (VP (VB improve) (NP (JJ urban) (NN air) (NN quality))))))))) (. .)))
These numbers are large enough to warrant serious attention by environmentalists, and no one disagrees that cleaning up auto emissions would help improve urban air quality.
(ROOT (S (S (VP (VBG Limiting) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS cars)) (PP (IN on) (NP (DT the) (NNS roads)))))))) (VP (MD would) (ADVP (RBS most) (RB likely)) (VP (VB improve) (NP (DT the) (NN air) (NN quality)) (PP (IN in) (NP (JJ large) (NNS texas) (NNS cities))))) (. .)))