It is important to understand that none of the charts and graphs that purport to depict the Earth's climate ever show you raw data. None. Always, the data are adjusted; and always, the data for the late 20th century are adjusted upward. Computer scientist Charlie Martin cites an example:
The Climategate files forced the UK Meteorological Office to make at least part of their raw data available. One of the first was Willis Eschenbach, at Watts Up With That. Read the whole discussion and also Eschenbach's answer to a critique published in the Economist for the details, but here is the "money shot":
In this figure, the blue line is the raw data. The black line is the adjustments that had been applied to that data, and the red line is the result following the adjustments.
That's right--the purported warming is all in the way the data are adjusted. This happens over and over again. Are these adjustments based on science or politics? If you've read the East Anglia emails, as I have, the question answers itself. The global warming project is political to its core, and lacks any scientific integrity.
UPDATE: Sometimes, of course, the data are hard to ignore. Snow is falling in Copenhagen; here, a couple of residents brush snow off the "overheating" globe:
http://www.powerlineblog.com/archives/2009/12/025182.php
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