It was a well-known and understood roughly 300-year localized warmer period[1] in Western Europe and the North Atlantic. The planet has been globally warmer tha

It was a well-known and understood roughly 300-year localized warmer period[1] in Western Europe and the North Atlantic. The planet has been globally warmer than what it is now but that was long before H. sapiens and has nothing to do with the Vikings or barley. [1] https://en.wikipedia.org/wiki/Medieval_Warm_Period https://en.wikipedia.org/wiki/Medieval_Warm_Period