NOAA seems to have changed its tune, and is now admitting there was a Medieval Warm Period, but it wasn't quite as warm as the 20th and 21st Centuries. They even go so far as to admit "Norse seafaring and colonization around the North Atlantic at the end of the 9th century indicated that regional North Atlantic climate was warmer during medieval times than during the cooler 'Little Ice Age' of the 15th - 19th centuries," a big change from back when they were disparaging reliance on contemporary accounts and archeology, darkly hinting that the Medieval Warm Period had some kind of political agenda behind it.
Viking Woman: Where are you going?
Viking Man: I'm going to Greenland.
Viking Woman: Why in the Hel would you go there? Everyone knows it's just a barren wasteland of ice, since the Industrial Revolution has not yet come to melt all the ice away and strand polar bears.
Viking Man: I'm going to build some fake settlements under the ice, and maybe plant a vinyard or two.
Viking Woman: What?! Why?!
Viking Man: We're going to use it to embarrass a future politician who will live south of Newfoundland named Al Gore.
Viking Woman: Why would you care about someone who won't be born for centuries?
Viking Man: Because I'm a secret operative working for Karl Rove! All the materials were provided to me by Halliburton! Muhahahaha!
By the way, don't bother looking for the older page I linked to. It has apparently been erased.
*h/t Slouching Toward Extimacy.