Why was the medieval warm period such a contrast to the period from the 14-16th centuries?

The Medieval Warm Period (MWP) also known as the Medieval Climate Optimum, or Medieval Climatic Anomaly was a time of warm climate in the North Atlantic region lasting from c. 950 to c. 1250. It was likely related to warming elsewhere while some other regions were colder, such as ... They also found that the warming during the 10–14th centuries in some ..

Explanation:

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i hope this your understandings.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.