(S (S (PP (VBG According) (PP (TO to) (BASENP (NNP CSIRO) (NN research) (NN scientist) (NNP Dr) (NNP Mike) (NNP Raupach)))) (COMMA ,) (S (S (NP (BASENP (QP (NN 7.9) (NN billion)) (NNS tonnes)) (PP (IN of) (BASENP (NN carbon)))) (VP (VBD were) (VP (VP (VP (VP (VBN emitted) (PP (IN into) (BASENP (DT the) (NN atmosphere)))) (PP (IN as) (BASENP (NN carbon) (NN dioxide)))) (PP (IN in) (BASENP (NN 2005)))) (PRN (COLON -) (NP (NP (BASENP (DT a) (NN doubling)) (PP (IN in) (NP (BASENP (DT the) (NN rate)) (PP (IN of) (BASENP (NN increase)))))) (PP (IN since) (BASENP (NN 1990)))) (COLON -))))) (CC and) (S (NP (BASENP (DT the) (NN rate)) (PP (IN of) (BASENP (NN increase)))) (VP (VBZ continues) (S (VP (TO to) (VP (VB accelerate)))))))) (PERIOD .))