New paper confirms the climate was warmer 1000 years ago: Data from 91 Northern Hemisphere proxies was used to reconstruct temperature — Published in Climate of the Past
This new analysis shows that the warming we have seen in the late-20th century is not unprecedented. Seen in the reconstruction is a well-defined peak of temperature between 950–1050 AD. They also find that the first millennium is warmer than the second...research makes a significant contribution to a growing body of evidence that both the global extent of the MWP, and the temperature was similar, or even greater than the Current Warm Period'
The reconstruction of past climate has improved significantly in the past few years due to the availability of more proxies and better statistical analysis. The authors acknowledge this and point out the differences that are emerging from the reconstructions conducted about a decade ago. They mention two such reconstructions performed by Michael Mann that they say, perhaps typically for the period, show little variability.