(S (S (QT (DQL ``) (QTC (S (S (VP (TO To) (VP (VBP have) (NP (NP (BASENP (NN four) (NNS years)) (PP (IN in) (BASENP (DT a) (NN row)))) (PP (IN of) (BASENP (JJ above-average) (NN carbon) (NN dioxide) (NN growth))))))) (VP (VBZ is) (ADJP (JJ unprecedented)))) (COMMA ,)) (DQR '')) (S (BASENP (NNP Dr) (NNP Fraser)) (VP (VBD said)))) (PERIOD .))