It's from all the greenhouse gasses that we, as an industralized people, are pumping out into the atmosphere. Our sun is a fixed star and has nothing to do with the upcoming global warming cooling. From Dr. Tony Philips at NASA's Space Weather website:
The Chill of Solar Minimum
The sun is entering one of the deepest Solar Minima of the Space Age. Sunspots have been absent for most of 2018, and the sun’s ultraviolet output has sharply dropped. New research shows that Earth’s upper atmosphere is responding.
“We see a cooling trend,” says Martin Mlynczak of NASA’s Langley Research Center. “High above Earth’s surface, near the edge of space, our atmosphere is losing heat energy. If current trends continue, it could soon set a Space Age record for cold.”
Quite the nip in the air here - thinking of building a fire to warm the house up a bit. I have a heat pump running in my new DaveCave so it is nice and comfortable up there but down in the main room where I am working, there is a definite chill in the air. Plus, I can use it to get rid of the papers I am tossing.
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