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One of the biggest obstacles global warming alarmists have had to deal with is the inconvenient existence of the Medieval Warm Period (MWP), as there are reams of literature showing that this period was as warm or even warmer than today.

Photo right: Fritz Vahrenholt (Die kalte Sonne)

Yet, a number of global warming activists and alarmist scientists have tried air-brushing away its existence, or claimed it was a only a local North Atlantic phenomenon (just as Wikipedia does).

Now, thanks to the diligence of two German scientists, refuting or denying the existence MWP has just gotten a heck of a lot tougher. In fact from their results it is becoming clearer than ever that the MWP was real and worldwide.

Lüning’s and Vahrenholt’s interactive Medieval Warm Period Map. The period was real and global. Click on the image and the markers to link to the literature underpinning the MWP. On the left side of the map you’ll find the entire list of the literature. The red markers show warm conditions during the MWP, the yellow markers show drought conditions, green markers show wetter conditions and the blue markers show cooling during the MWP. So far there has not been any study indicating a temperature fall!

Geologist Dr. Sebastian Lüning and chemist Professor Fritz Vahrenholt have been working meticulously on producing an interactive Medieval Warming Period Map (above) which allows easy access to the robust scientific literature underpinning the MWP.

Medieval Warm Period was a global phenomenon

Now the first results of their Medieval Warming Period Map are in, they tell us so far in no uncertain terms that not only was the MWP real in the North Atlantic, but it was in fact a global phenomenon.

So far the Medieval Warming Period Map has 157 markers plotted on it. Each plotted marker has an embedded link to the literature which shows the MWP’s existence for that location. As we can see, the 157 studies represented by the markers are scattered all over the globe.

Climate models fail to reproduce the MWP

What drove Vahrenholt and Lüning to produce the Medieval Warming Period Map?

They write here that in addition to the dubious efforts aimed at erasing the warm period from history, the climate models have so far been unable to reproduce it. Even the IPCC in its AR5 climate report (IPCC, 2013a, chapter 5.3.5) openly acknowledges the models fail reproduce the MWP warming.

Unanswered questions, faulty models

This brings up some crucial questions that Vahrenholt and Lüning pose:

How could it have been as warm as it is today when the CO2 concentration was much lower? Which climate factors were at play back then that are today not adequately accounted for in the climate models? If the models were recalibrated, what results would they show for the future?”

These are tremendously inconvenient questions for the climate modelers and scientists, and so it is not a surprise that some have tried to erase the MWP from history. And these Orwellian white-washing efforts continue today.

Lüning writes, in a response to my e-mail inquiry: “There are still scientists who deny the global character of the MWP. […] The most recent example where such data is needed is a publication by Young et al.”

Photo right: Dr. Sebastian Lüning (Die kalte Sonne)

The project continues…100s more studies to be plotted

Clearly Lüning’s and Vahrenholt’s MWP Map is a valuable, if not an essential tool for referencing the history of our climate. Professor Vahrenholt wrote in an e-mail:

The Medieval Warming Period Map is a resource that gives us rapid and easy access to the crucial scientific literature underpinning the existence of a worldwide Medieval Warming.”

Though the MWP Map already delivers robust results, Lüning writes that there are still hundreds of papers that need to be assessed, plotted and linked. To fund the project Vahrenholt and Lüning have been busy trying to raise the 25,000 euros needed to cover the expenses – a real bargain compared to the tens of millions flowing into the IPCC reports.

So far they have raised some 11,000 euros and the two scientists are confident they will be able to scrape together the remaining funding from private sources that is needed to finish the job.

Readers are welcome to make donations. Every amount helps:

Prof. Dr. Fritz Vahrenholt

Bank: Hamburger Sparkasse

Account No. 1280579069

Routing No.: 20050550

IBAN: DE93200505501280579069

BIC: HASPDEHHXXX

When transferring please note: MWP-Projekt