The leaked emails in Climategate 2.0 have dealt another slap shot to Al Gore's famous hockey stick. For those unfamiliar with the controversy surrounding this fraud let me set the background. In order to make the case for global warming its proponents had to disprove the historically documented "medieval warming period." During that time the Vikings colonized Greenland and farmed it. Vineyards flourished in far north Scotland. If it was warmer 500 years ago than it is today the global warming experienced in the last 150 years is hardly an aberration.
There are no temperature date for the middle ages so the theory that growth rings from thousand year old trees could be used as proxies for temperature data was developed. The wider the tree ring; the warmer the climate so the theory went. All went well until the temperature date from the 1960's onward was compared to the temperature reconstructions showed that as actual temperature increased the tree rings got narrower. University of Pennsylvania professor Michael Mann got around this by splicing real temperature data to the tree ring temperature proxies to "hide the decline." Now Steve McIntyre of Climate Audit says this academic fraud is worse than we thought. Mann and company deleted tree ring data from 1940 on and covered up by producing a disingenuous chart. The extreme upward trend in the 1990's is actual temperature data. It is the red line. Notice that the temperature from the proxies do not spike upward.
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