(S (S (PP (IN During) (BASENP (DT the) (JJ past) (NN century))) (COMMA ,) (S (S (BASENP (JJ global) (NN surface) (NNS temperatures)) (VP (VBP have) (VP (VBN increased) (NP (NP (QP (RB approximately) (NN 0.06)) (NP (BASENP (NNS degrees)) (ADJP (JJ C)))) (PP (IN per) (BASENP (NN decade))))))) (CONJP (COMMA ,) (CC but)) (S (PP (IN since) (BASENP (NN 1976))) (S (NP (BASENP (DT the) (NN rate)) (PP (IN of) (BASENP (NN increase)))) (VP (VBZ has) (VP (VBN been) (NP (NP (QP (RB about) (NN 0.18)) (NP (BASENP (NNS degrees)) (ADJP (JJ C)))) (PP (IN per) (BASENP (NN decade)))))))))) (PERIOD .))