(S (S (S (BASENP (NNS Plastics)) (VP (VBP have) (VP (VBN been) (VP (ADVP (RB widely)) (VP (VP (VBN used) (PP (IN in) (BASENP (NNP Australia)))) (PP (IN in) (BASENP (DT the) (JJ past) (JJ few) (NNS decades)))))))) (CC but) (S (BASENP (NNS environmentalists)) (VP (VBP say) (SBAR (S (BASENP (JJ plastic) (NNS bags)) (VP (VBP have) (VP (VBN had) (NP (BASENP (DT a) (JJ devastating) (NN impact)) (PP (IN on) (NP (BASENP (DT the) (NN nation) (POS 's)) (BASENP (JJ natural) (NN environment)))))))))))) (PERIOD .))