“The star that keeps us alive has, over the last few years, been almost free of sunspots, which are visual signs of the Sun’s magnetic activity.” He notes that “Solar activity has always varied. Around the year 1000, we had a period of very high solar activity which coincided with the Medieval Warm Period. But after about 1300, solar activity declined, and the world began to get colder. It was the beginning of the episode we now call the Little Ice Age.”
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