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From NASA - volcanic vs solar activity: https://pubs.giss.nasa.gov/abs/st07500u.html

"volcanos erupted causing a cold period that lasted from the 1600s to the late 1800s"

Correlation vs causation - while the volcanic winter phenomenon is well-known, there are those that propose that solar activity is the primary driver of climate on Earth:



Not to say that the greenhouse effect is not real, or that anthropogenic CO2 does not cause warming - just that the magnitude of the effect may well be greatly over-hyped.

You'll probably get flak for linking to breitbart.

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