The Strata-sphere has found that surface temperature measurements fail to show twentieth century global warming. The raw CRU data released in Climategate shows that surface temperature readings measure the first half of the last century (1900-1960) as warm or warmer than it is today.
John Pittman has found some interesting science in the Climategate emails: The treeline is an sensitive treemometer, since it is very sharply defined, a few kilometers broad. Trees grow, just barely, south of the treeline, they entirely fail to grow north of the treeline. During the Medieval climatic optimum 750-1450 trees grew north of the present day treeline, indicating that the medieval climatic optimum was warmer than today in the north. During the past century, 1897 to present, there has been no movement in the treeline, indicating no twentieth century warming in the north,none.
Global sea ice area has also remained constant since it has been observed, from 1978 to the present.
