( ( environmental issues ) ( ( involving ( chemistry ( such ( as ( ( ( ( ( ( recycling , ) ( acid ( rain ( , ( air ( and ( water pollution ) ) ) ) ) ) ) , ) ( global warming ) ) , ) ( ozone depletion ) ) ) ) ) ) ; ) )
(ROOT (S (NP (JJ environmental) (NNS issues)) (VP (VBG involving) (NP (NP (NN chemistry)) (PP (JJ such) (IN as) (NP (NP (NN recycling)) (, ,) (NP (JJ acid) (NN rain) (, ,) (NN air) (CC and) (NN water) (NN pollution)) (, ,) (NP (JJ global) (NN warming)) (, ,) (NP (NN ozone) (NN depletion)))))) (: ;)))
environmental issues involving chemistry such as recycling, acid rain, air and water pollution, global warming, ozone depletion;
(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)))) (. .)))