Even if the sun were to quieten down appreciably for the rest of this century, it would still be business as usual for global warming.rnThe sun goes through an 11-year solar cycle during which its luminosity varies according to the number of sunspots appearing on its face. The normal cycle has a small effect on Earth's weather. But sometimes lulls in sunspot activity can last several decades, driving down the sun's luminosity to a "grand minimum". The Maunder minimum lasted from 1645 to 1715 and may have contributed to the little ice age.
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