(S (S (SBAR (IN Though) (S (BASENP (NNP Iran)) (VP (VBZ has) (BASENP (JJ large) (NN oil) (NNS stocks))))) (COMMA ,) (S (NP (BASENP (JJ environmental) (NNS concerns)) (CC and) (BASENP (DT the) (NNP Kyoto) (NNP Protocol))) (VP (MD may) (VP (VB preclude) (BASENP (PRPD their) (JJ continued) (NN development)))))) (PERIOD .))