(S (S (BASENP (DT The) (NN audience)) (VP (VBD noted) (NP (NP (NP (NP (BASENP (DT the) (NN melting)) (PP (IN of) (BASENP (NN ice) (NN sheets)))) (COMMA ,) (BASENP (NN air) (NN quality))) (COMMA ,) (BASENP (NNP Hurricane) (NNP Katrina))) (CC and) (BASENP (NNP Al) (NNP Gore))))) (PERIOD .))