(S (S (NP (BASENP (JJ Average) (NNS temperatures)) (PP (IN in) (BASENP (DT the) (NN Antarctic) (NN peninsula)))) (VP (VBP have) (VP (VP (VBN increased) (PP (IN by) (NP (NP (QP (RB about) (NN 2.5)) (NP (BASENP (NNS degrees)) (ADJP (JJ Celsius)))) (PRN (LRB -LRB-) (NP (NN 3.8) (NP (BASENP (NNS degrees)) (ADJP (JJ Fahrenheit)))) (RRB -RRB-))))) (PP (IN in) (BASENP (DT the) (JJ past) (NN fifty) (NNS years)))))) (PERIOD .))