[AndyTheBear]

Why is this important? Because previous work on the Medieval Warm Period has indicated that it was primarily a Northern Hemisphere event strongest in North America and Europe. (The LIA was more global.) So seeing it (a warming event occurring over about 400 years) in this data is not surprising.

Is not the current warming trend also more pronounced in the Northern Hemisphere?

[cogitator]

Is not the current warming trend also more pronounced in the Northern Hemisphere?

Yes. Land surfaces warm up considerable faster than the ocean, and there's a big difference between northern and southern hemisphere land area.