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

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.