( ( Air ( Pollution ( Air ( pollution causes ) ) ) ) ( ( harm ( to ( ( ( ( ( ( the health ) ( of ( ( humans , ) ( defoliation ( of plants ) ) ) ) ) , ) ( ( ( ( decreased ( crop yields ) ) , ) ( acid rain ) ) , ) ) and ) ( decreased visibility ) ) ) ) . ) )
(ROOT (S (NP (NNP Air) (NNP Pollution) (NNP Air) (NN pollution) (NNS causes)) (VP (VBP harm) (PP (TO to) (NP (NP (NP (DT the) (NN health)) (PP (IN of) (NP (NP (NNS humans)) (, ,) (NP (NP (NN defoliation)) (PP (IN of) (NP (NNS plants))))))) (, ,) (NP (NP (VBN decreased) (NN crop) (NNS yields)) (, ,) (NP (JJ acid) (NN rain)) (, ,)) (CC and) (NP (VBN decreased) (NN visibility))))) (. .)))
Air Pollution Air pollution causes harm to the health of humans, defoliation of plants, decreased crop yields, acid rain, and decreased visibility.
(ROOT (S (NP (JJ Acid) (NN rain)) (VP (MD may) (VP (VB be) (VP (VBN caused) (PP (IN by) (NP (NN air) (NN pollution)))))) (. .)))