( ( ( The most ) ( frequently ( mentioned ( causes ( of ( adverse change ) ) ) ) ) ) ( ( ( include eutrophication ) ( as ( ( a result ) ( of ( ( excess nutrients ) ( from ( ( sewage and ) agriculture ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NP (DT The) (JJS most)) (VP (ADVP (RB frequently)) (VBN mentioned) (NP (NP (NNS causes)) (PP (IN of) (NP (JJ adverse) (NN change)))))) (VP (VBP include) (NP (NN eutrophication)) (PP (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (NP (JJ excess) (NNS nutrients)) (PP (IN from) (NP (NN sewage) (CC and) (NN agriculture)))))))) (: ;)))
The most frequently mentioned causes of adverse change include eutrophication as a result of excess nutrients from sewage and agriculture;
(ROOT (S (NP (NP (DT An) (NN excess)) (PP (IN of) (NP (NP (NNS fertilizers)) (CC and) (NP (JJ other) (NNS nutrients))))) (VP (VBZ causes) (ADJP (JJ eutrophication) (S (VP (TO to) (VP (VB occur)))))) (. .)))