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Thursday
Jul122012

Oops! Climate Actually Has Been Cooling for 2,000 Years

Not that it matters to those on the left for whom manmade global warming/climate change is a religion, but yet more evidence has been presented that they don’t know what they are talking about.

Researchers found that temperatures were warmer during the Roman era and Middle Ages than previously believed. And they determined that the climate globally has been cooling by about 0.3 degrees Centigrade during each of the past 1,000 years

Here is how Fox News reported it:

A new study in the journal Nature Climate Change shows a long-term cooling trend playing out over the past 2,000 years.

An international team of scientists used tree-ring density measurements to reconstruct temperatures going back to 138 B.C. 

They found cooling by a little over a half-degree Fahrenheit per millennium due to gradual changes in position between the sun and the earth.

They note that -- quote -- "The large-scale climate reconstruction shown by the Intergovernmental Panel on Climate Change (IPCC) likely underestimate this long-term cooling trend over the past few millennia." 

And here is what the lead scientist, Dr. Jan Esper from Johannes Gutenberg University Mainz, had to say:

"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."

In publicizing the findings, the university added:

In addition to the cold and warm phases, the new climate curve also exhibits a phenomenon that was not expected in this form. For the first time, researchers have now been able to use the data derived from tree-rings to precisely calculate a much longer-term cooling trend that has been playing out over the past 2,000 years.

Their findings demonstrate that this trend involves a cooling of -0.3°C per millennium due to gradual changes to the position of the sun and an increase in the distance between the Earth and the sun.

"This figure we calculated may not seem particularly significant," said Esper.

"However, it is also not negligible when compared to global warming, which up to now has been less than 1°C. Our results suggest that the large-scale climate reconstruction shown by the Intergovernmental Panel on Climate Change (IPCC) likely underestimate this long-term cooling trend over the past few millennia."

Okay, Mr. Gore, your turn.

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