( Moreover ( , ( ( Antarctic seas ) ( ( are ( uniquely ( subject ( to ( ( the impacts ) ( of ( ( ( ocean acidification ) , ) ( ( the result ) ( of ( oceans ( absorbing ( ( anthropogenic ( atmospheric ( carbon dioxide ) ) ) ( -LRB- ( CO2 -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Moreover)) (, ,) (NP (JJ Antarctic) (NNS seas)) (VP (VBP are) (ADJP (RB uniquely) (JJ subject) (PP (TO to) (NP (NP (DT the) (NNS impacts)) (PP (IN of) (NP (NP (NN ocean) (NN acidification)) (, ,) (NP (NP (DT the) (NN result)) (PP (IN of) (NP (NP (NNS oceans)) (VP (VBG absorbing) (NP (NP (JJ anthropogenic) (JJ atmospheric) (NN carbon) (NN dioxide)) (PRN (-LRB- -LRB-) (NP (NNP CO2)) (-RRB- -RRB-))))))))))))) (. .)))
Moreover, Antarctic seas are uniquely subject to the impacts of ocean acidification, the result of oceans absorbing anthropogenic atmospheric carbon dioxide (CO2).
(ROOT (S (NP (NNP Ocean) (NNP acidification)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NP (JJ excess) (NN carbon) (NN dioxide)) (PP (IN in) (NP (DT the) (NN atmosphere)))) (VP (VBZ causes) (S (NP (DT the) (NNS oceans)) (VP (TO to) (VP (VB become) (NP (NNS acidic))))))))) (. .)))
Ocean acidification occurs when excess carbon dioxide in the atmosphere causes the oceans to become acidic.