(S (S (S (BASENP (PRP They)) (VP (VP (VBP do) (RB not)) (VP (VP (VB produce) (BASENP (NN pollution))) (BASENP (PRP themselves))))) (COMMA ,) (S (ADVP (RB rather)) (COMMA ,) (S (BASENP (PRP they)) (VP (VP (VBP carry) (PRT (RP in))) (NP (BASENP (JJ other) (NNS forms)) (PP (IN of) (BASENP (JJ marine) (NN pollution)))))))) (PERIOD .))