(S (S (ADVP (RB Still)) (COMMA ,) (S (NP (NP (BASENP (JJ many)) (PP (IN of) (NP (BASENP (DT the) (NN world) (POS 's)) (BASENP (JJ leading) (VBG polluting) (NNS countries))))) (PRN (COMMA ,) (PP (VBG including) (NP (BASENP (DT the) (NNP United) (NNPS States)) (PP (IN of) (BASENP (NNP America))))) (COMMA ,))) (VP (VP (VBP have) (RB not)) (VP (ADVP (RB yet)) (VP (VBN introduced) (NP (BASENP (DT any) (NN legislation)) (VP (VBN intended) (S (VP (TO to) (VP (VB reduce) (NP (BASENP (DT the) (NN usage)) (PP (IN of) (BASENP (JJ plastic) (NNS bags)))))))))))))) (PERIOD .))