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About a thousand years ago was the Medieval Warm Period or Medieval Optimum. History had the development of Norse colonies in Greenland (lots of open fields for growing crops etc.), exploration and whaling off the coast of North America. It is likely that sea ice and glaciers were much reduced from previous years. These endeavors failed as the temperature became colder and the world moved into the Little Ice Age. Like any climate change currents and air flow can make some areas colder than others in the "warm" periods.

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Q: It was much warmer about 1000 years ago why didn't the arctic ice melt then?
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