FYI …

… Scientists use rare mineral to correlate past climate events in Europe, Antarctica.

They compared the results with climate conditions established in Northern Europe across a 2,000-year time frame. They found a direct correlation between the rise and fall of oxygen 18 in the crystals and the documented warming and cooling periods.

“We showed that the Northern European climate events influenced climate conditions in Antarctica,” [geochemist Zunli] Lu says.

In other words, the Medieval Warm Period wasn't confined to Europe.