The one and only reason that the globalwarmingwhackos have steadfastly maintained that the Medieval Warming was not world wide is that the Science showing the warming there is Absolutely Irrefutable. When someone devises an equally good way of establishing that it was, in fact, worldwide, they'll figure out some other way to lie and obfuscate to their moronic target masses. I've yet to hear any of their vaunted "models" demonstrate any possible methodology for maintaining a warm Arctic for centuries without other major climactic ramifications, but their "faith" allows them to simply 'know' that earth is warmer now than ever before - because man's activities 'clearly' makes it that way.
It is amazing that those brilliant and super-advanced Islamists and Chinese and Africaners and Native Americans didn't maintain weather records during the 10th-17th Century so they could show how steady the global temperatures were for today's envirowhackos. A mere oversight on their parts, I suppose.
See reply 63 for your edification.