( ( ( ( air pollution ) , ) ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( global warming ) , ) ( acid rain ) ) , ) deforestation ) , ) ( water pollution ) ) , ) ( ozone depletion ) ) , ) ( human ( population growth ) ) ) , ) ( species extinction ) ) , ) and ) more ) ) . )
(ROOT (NP (NP (NN air) (NN pollution)) (, ,) (NP (NP (JJ global) (NN warming)) (, ,) (NP (JJ acid) (NN rain)) (, ,) (NP (NN deforestation)) (, ,) (NP (NN water) (NN pollution)) (, ,) (NP (NN ozone) (NN depletion)) (, ,) (NP (JJ human) (NN population) (NN growth)) (, ,) (NP (NN species) (NN extinction)) (, ,) (CC and) (NP (JJR more))) (. .)))
air pollution, global warming, acid rain, deforestation, water pollution, ozone depletion, human population growth, species extinction, and more.
(ROOT (S (NP (NNP Air) (NN pollution)) (VP (VBZ causes) (NP (NP (JJ acid) (NN rain)) (, ,) (NP (NN ozone) (NN depletion)) (, ,) (CC and) (NP (JJ global) (NN warming)))) (. .)))