(S (S (BASENP (NN Climate) (NN change)) (VP (VBZ is) (VP (VBN thought) (S (VP (TO to) (VP (VB have) (VP (VBN presented) (S (NNS opportunities) (SBAR (IN for) (S (BASENP (DT the) (NN two) (NNS species)) (VP (TO to) (VP (VP (VB mate) (ADVP (RB now) (CC and) (RB then))) (PP (IN in) (BASENP (DT the) (JJ past) (NN 100,000) (NNS years))))))))))))))) (PERIOD .))