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Global Warming -- it was a good thing:

the warmest, or most extreme, climate for those locations over approximately the last 1000 years tended to occur sometime between the 9th and 14th centuries, in what is called the Medieval Warm Period. That period of extreme climate - long before the air's significant increase in greenhouse gas concentration from human activities - must have natural explanations. Whatever they are, the consequences of the warming, as far as man was concerned, were scarcely dangerous. Vikings made their way to Greenland, Iceland and North America in that period. England had vineyards. H.H. Lamb, the founder of the climatic research unit at East Anglia University, found that England's climate was warm enough in the 12th and 13th Centuries to support more than 50 vineyards, signifying that May frosts were rare. William of Malmesbury noted in De Pontificibus: "No county in England has so many or so good vineyards as this Gloucester." By the 14th Century, that warmth had eroded, heralding a period now known as the Little Ice Age, lasting approximately from 1300 to 1900 C.E. Europe, for example, experienced more acute winters, frost and year-to-year climate variability, and the worst of the Little Ice Age from 1550 to 1700. The human effects were tragic: In Scotland severe weather in seven of the last eight years of the 18th century produced one of Scotland's deadliest famines of the last 1000 years.