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The prestigious Nature Journal recently published a major climate change study named Orbital Forcing Of Tree-Ring Data that proves through analysis of over 2000 years of tree ring evidence that current climate models substantially underestimated ancient Northern Europe temperatures levels during the Roman and Medieval Periods. The fact that temperatures have trended down for the last two centuries debunks theories that anthropogenic (man-made) global-warming is caused by a rising CO2 gas levels associated with industrial burning of “fossil fuels.”
Researchers from Germany, Finland, Scotland, and Switzerland examined tree-ring density profiles in trees from Finnish Lapland. In this extremely cold environment, trees often collapse into one of the numerous lakes, where they remain well preserved for thousands of years. The international team was able to conduct high reliability calculations of tree ring density from the cold water preserved Scandinavian pine trees, which correlate very closely with annual summer temperature patterns. 
The United Nations’ endorsed Intergovernmental Panel on Climate Change (IPCC) won the 2007 Nobel Peace Prize with Al Gore for interpreting studies of ice cores and ocean sediments to “conclude” that Europe was about to suffer catastrophic anthropogenic (man-made) global warming. But new Tree Ring Data allows precise measurements of annual climate variability. The results reveal there has been a cooling trend of -0.3°C (0.54°F) per millennia (1000 year periods) “due to gradual changes to the position of the sun and an increase in the distance between the Earth and the sun.” The high-resolution graph shown above demonstrates that temperatures ancient periods were much warmer than predicted by IPCC. The study also documents the extreme temperature phases that occurred during Europe’s “Little Ice Age” that resulted in a general cooling trend between the 1150 and 1460 AD and extremely cold climate between 1560 and 1850 AD. According to lead researcher Jan Esper:
“We found that previous estimates of historical temperatures during the Roman era and the Middle Ages were too low” … “Such findings are also significant with regard to climate policy, as they will influence the way today’s climate changes are seen in context of historical warm periods.”
The results are a huge embarrassment to IPCC, which has acknowledged it did not carry out its own original research to monitor climate and related phenomena. But their extrapolated conclusions regarding a recent warming trend served as justification for the United Nations Framework Convention on Climate Change (UNFCCC) to demand Western industrialized nations implement the job killing Kyoto Protocol treaty to achieve “stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system.”
In a direct broadside against global-warming doomsday alarmists, Esper noted:
The Tree Ring study proves the recent warming trend we are experiencing is not exceptional, because temperatures have been exceeded for at least two periods over the last 2000 years. Paleoclimatologists describe the warming of the earth over the last 12,000 years as the Holocene inter-glacial of the current Ice Age. The prior Eemian interglacial period, which began 130,000 years ago and ended 114,000 years ago, was much warmer. Scandinavia was an island, hippos swam in the Thames at the site of London, and the raised beaches of Alaska & fossil reefs of the Bahamas were formed.
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