Pinatubo
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Visioni: Major 20th-century volcanic eruptions measurably cooled the planet for years
“On the other hand, when these sulfate aerosols in the stratosphere, they stay for one year or longer, and so we have observed in past volcanic eruptions, Pinatubo in 1991, other three or four that have been in the 20th century, that they have cooled the planet…”