Climategate U-turn as scientist at center of row admits: There has been no global warming since 1995.
"There is some truth in that. We do have a trail of where the weather stations have come from but it’s probably not as good as it should be." ‘There’s a continual updating of the dataset. Keeping track of everything is difficult. Some countries will do lots of checking on their data then issue improved data, so it can be very difficult. We have improved but we have to improve more."
But climate change advocates have dismissed this as false or only applying to the northern part of the world. Professor Jones departed from this consensus when he said:
‘There is much debate over whether the Medieval Warm Period was global in extent or not. The MWP is most clearly expressed in parts of North America, the North Atlantic and Europe and parts of Asia.'
‘For it to be global in extent, the MWP would need to be seen clearly in more records from the tropical regions and the Southern hemisphere. There are very few palaeoclimatic records for these latter two regions. ‘Of course, if the MWP was shown to be global in extent and as warm or warmer than today, then obviously the late 20th Century warmth would not be unprecedented. On the other hand, if the MWP was global, but was less warm than today, then the current warmth would be unprecedented.’
He said that until all the data was released, skeptics could not test it to see if it supported the conclusions claimed by climate change advocates. He added that the professor’s concessions over medieval warming were ‘significant’ because they were his first public admission that the science was not settled.[source]