Lead author: Peter Foukal
Where published: Nature
Sunspots alter the amount of energy Earth gets from the sun, but not enough to impact global climate change ... The difference in brightness between the high point of a sunspot cycle and its low point is less than 0.1 percent of the sun's total output ... If you run that back in time to the 17th century using sunspot records, you'll find that this amplitude variance is negligible for climate.
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