( ( Due ( to ( ( rising ( carbon dioxide ) ) ( in ( ( the ( Earth 's ) ) atmosphere ) ) ) ) ) ( , ( ( ( the oceans ) ( of ( the future ) ) ) ( ( are ( ( ( projected ( to ( absorb ( more ( carbon dioxide ) ) ) ) ) , ) ( leading ( to ( acidification ( of ( the water ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (JJ Due) (TO to) (NP (NP (VBG rising) (NN carbon) (NN dioxide)) (PP (IN in) (NP (NP (DT the) (NN Earth) (POS 's)) (NN atmosphere))))) (, ,) (NP (NP (DT the) (NNS oceans)) (PP (IN of) (NP (DT the) (NN future)))) (VP (VBP are) (VP (VBN projected) (S (VP (TO to) (VP (VB absorb) (NP (JJR more) (NN carbon) (NN dioxide))))) (, ,) (S (VP (VBG leading) (PP (TO to) (NP (NP (NN acidification)) (PP (IN of) (NP (DT the) (NN water))))))))) (. .)))
Due to rising carbon dioxide in the Earth's atmosphere, the oceans of the future are projected to absorb more carbon dioxide, leading to acidification of the water.
(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.