( ( ( Emissions ( of ( carbon dioxide ) ) ) ( -LRB- ( ( CO 2 ) -RRB- ) ) ) ( ( ( will also ) decline ) . ) )
(ROOT (S (NP (NP (NP (NNS Emissions)) (PP (IN of) (NP (NN carbon) (NN dioxide)))) (PRN (-LRB- -LRB-) (NP (QP (CD CO) (CD 2))) (-RRB- -RRB-))) (VP (MD will) (ADVP (RB also)) (VP (VB decline))) (. .)))
Emissions of carbon dioxide (CO 2 ) will also decline.
(ROOT (S (NP (NNP Co) (CD 2)) (VP (VBZ is) (NP (NP (DT the) (JJ molecular) (NN formula)) (PP (IN of) (NP (NN carbon) (NN dioxide))))) (. .)))