( ( ( Global concerns ) ( such ( as ( ( ( ( ( ( ( ( ( ( ( ( global warming ) , ) ( ozone depletion ) ) , ) ( acid precipitation ) ) , ) ( tropical ( rain ( forest removal ) ) ) ) , ) ( water pollution ) ) , ) and ) desertification ) ) ) ) . )
(ROOT (NP (NP (JJ Global) (NNS concerns)) (PP (JJ such) (IN as) (NP (NP (JJ global) (NN warming)) (, ,) (NP (NN ozone) (NN depletion)) (, ,) (NP (JJ acid) (NN precipitation)) (, ,) (NP (JJ tropical) (NN rain) (NN forest) (NN removal)) (, ,) (NP (NN water) (NN pollution)) (, ,) (CC and) (NP (NN desertification)))) (. .)))
Global concerns such as global warming, ozone depletion, acid precipitation, tropical rain forest removal, water pollution, and desertification.
(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)))) (. .)))