( ( In particular ) ( , ( ( ( carbon ( dioxide levels ) ) ( in ( ( the ( ( atmosphere and ) changes ) ) ( in ( ( the salinity ) ( of ( the ( ocean water ) ) ) ) ) ) ) ) ( ( ( are also ) ( important ( in ( causing ( these ( climate changes ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (ADJP (JJ particular))) (, ,) (NP (NP (NN carbon) (NN dioxide) (NNS levels)) (PP (IN in) (NP (NP (DT the) (NN atmosphere) (CC and) (NNS changes)) (PP (IN in) (NP (NP (DT the) (NN salinity)) (PP (IN of) (NP (DT the) (NN ocean) (NN water)))))))) (VP (VBP are) (ADVP (RB also)) (ADJP (JJ important) (PP (IN in) (S (VP (VBG causing) (NP (DT these) (NN climate) (NNS changes))))))) (. .)))
In particular, carbon dioxide levels in the atmosphere and changes in the salinity of the ocean water are also important in causing these climate changes.
(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.