The Alarmists originally tried to eliminate the MWP entirely. (Back-up link) They relied on the fraudulent MBH98 Hockey Stick. (Back Up Link.)
Then they tried to say that it was only a European or a Northern Hemisphere event -
From (UN)-Skeptical "Science:"
To claim the was warmer than today is to narrowly focus on a few s that showed unusual warmth. However, when we look at the broader picture, we see that the was a al phenomenon with other s showing strong cooling.
Unfortunately for Alarmists, Unskeptical Nonscience included, there a plethora of peer reviewed papers showing that it happened and that it was a world wide phenomenon. (Link)
A new pdf from the Science and Public Policy Institute (SPPI)( Link - pdf) titled "Evidence of a Medieval Warm Period in Antarctica" starts off asking the question:
Was there a Medieval Warm Period somewhere in the world in addition to the area surrounding the North Atlantic Ocean, where its occurrence is uncontested? This question is of utmost importance to the ongoing global warming debate, for if the Medieval Warm Period is found to have been a global climatic phenomenon, and if the locations where it occurred were as warm in medieval times as they are currently, there is no need to consider the temperature increase of the past century as anything other than
the natural progression of the persistent millennialscale oscillation of climate that regularly brings the earth several-hundred-year periods of modestly higher and lower temperatures that are totally independent of variations in atmospheric CO2 concentration.
Consequently, we here review the findings of several studies that have found evidence for the Medieval Warm Period in a region that is as far away from lands bordering on the North Atlantic Ocean as one could possibly get, i.e., Antarctica.They then list papers analysing data from Antarctica (inter alia):
- Hemer and Harris (2003) extracted a sediment core from beneath the Amery Ice Shelf, East Antarctica, at a point that is currently about 80 km landward of the location of its present edge;
- Khim et al. (2002) likewise analyzed a sediment core removed from the eastern Bransfield Basin just off the northern tip of the Antarctic Peninsula;
- Hall et al. (2010) working in the same general region of the Antarctic continent;
- Lu et al. (2012) constructed "the first downcore δ18O record of natural ikaite hydration waters and crystals collected from the Antarctic Peninsula (AP)" that they say were "suitable for reconstructing a low resolution ikaite record of the last 2000 years;"
- Hall and Denton (2002) conclude that "the Wilson Piedmont Glacier record is tantalizing in that it shows glacier advance about the same time as seen in the 'Little Ice Age' elsewhere," which clearly testifies of the global scope of that cold climatic period;
- Bertler et al. (2011) report that they identified three distinct time periods in their record: the last 150 years of the Medieval Warm Period (AD 1140 to 1287), the Little Ice Age (AD 1288 to 1807), and the Modern Era (AD 1808 to 2000);
- Noon et al (2003) The striking correspondence of this Southern Hemispheric millennial-scale climatic oscillation with the similar climatic oscillation revealed by MeDermott et al.'s Northern Hemispheric study provides convincing evidence for both the reality and global extent of the many several-century-long warm and cold periods that reverberate throughout the Holocene.