( ( Ocean pollution ) ( ( can ( cause ( algae ( to ( ( ( die and ) therefore ) ( not ( ( remove ( Carbon Dioxide ) ) ( from ( the atmosphere ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Ocean) (NN pollution)) (VP (MD can) (VP (VB cause) (ADJP (JJ algae) (S (VP (TO to) (VP (VP (VB die)) (CC and) (ADVP (RB therefore)) (VP (RB not) (VB remove) (NP (NNP Carbon) (NNP Dioxide)) (PP (IN from) (NP (DT the) (NN atmosphere)))))))))) (. .)))
Ocean pollution can cause algae to die and therefore not remove Carbon Dioxide from the atmosphere.
(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.