The Medieval Global Temperature Optimum or the Medieval Warm Period refers to a period between AD 950-1250. During this time temperatures were abnormally warm. This warmest period of the last 2,000 years. Following the Medieval Warm Period was a time known as the Little Ice Age. It was cold period between AD 1350 and 1850. Summers were cold and wet; this lead to decreased agricultural output, and in turn, various famines across different areas of the world. Harbors and ports froze over limiting shipping. Three particularly cold intervals took place during the Little Ice Age. The first beginning about 1650, the second about 1770, and the last in 1850, each separated by spans of slight warming. Theories have been suggested as to why both periods took place, but none have been fully confirmed.
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