Can mimicking the effects of Mount Pinatubo's volcanic ash plume help cool the earth?

A massive cloud of steam and ash coming out of Mount Pinatubo in the Philippines on June 12, 1991.
A massive cloud of steam and ash coming out of Mount Pinatubo in the Philippines on June 12, 1991.PHOTO: U.S. GEOLOGICAL SURVEY (USGS)

SINGAPORE - When Mount Pinatubo erupted in the Philippines in 1991, it spewed nearly 20 million tonnes of sulphur dioxide and ash so high into the atmosphere that it hung there for years, screening sunlight from reaching the Earth's surface.

As a result, the planet was about 0.5 deg C cooler until 1993.

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