Term (also Medieval Climate Optimum or Medieval Climate Anomaly) for a long period of about 900 to 1350 after Christ with warm climate, The climate phenomenon was regionally and temporally differently weighted. Because in other parts of the world it was much colder than today, for example in the tropical Pacific. The temperatures in the areas affected by the warming were about 1 to 2 degrees higher than during the subsequent cold period, the Little ice age, In the northern Atlantic, the pack ice retreated to the north, and the glaciers partially disappeared. This warming allowed the Vikings to colonize the island of Greenland (since 986), because the polar sea was ice-free in both directions and therefore navigable. The myth of a green, fertile Greenland, with climate change deniers in particular, is widespread viniculture but it is only a mar This rumor comes from the time of the exile of the navigator and explorer Erik the Red (950-1003) to Greenland towards the end of the first millennium. There it was bitterly cold and life tedious and Erik invented this lie to lure compatriots from Iceland to Greenland.
The cultivation limits in the German Mittelgebirge ranged about 200 m higher than today, so that the agriculture in the high Middle Ages (1050-1250) experienced a large expansion. The wine-growing border was then on the southern Baltic coast. Viticulture was thereby in East Prussia, Pommern and southern Scotland, as well as grain cultivation in Norway even up to the polar circle (66 ° north latitude) possible. Until the beginning of the 14th century were especially in Germany and France the vineyards also extended to steeper slopes. Less developed was the medieval warm period in other parts of the world. In some areas, the temperatures were even lower and in others there was no significant change. The causes are believed to be significantly increased solar activity and unusually low volcanic activity worldwide (volcanic activity darkens and clouds the atmosphere and causes a colder climate). These phenomena are today related to one feared climate Change quite similar. Nevertheless, you can not compare that, because the reasons for the warm period are not known exactly.