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The eruption of Mount Pinatubo in 1991 was one of the largest volcanic eruptions of the 20th century. The eruption ejected massive amounts of ash and sulfur dioxide into the atmosphere, which spread around the globe and had a profound impact on the Earth’s climate.

Sulfur dioxide gas reacts with water vapor in the atmosphere to form tiny sulfuric acid droplets. These droplets reflect sunlight back into space, cooling the Earth’s surface. The eruption of Mount Pinatubo injected about 20 million tons of sulfur dioxide into the atmosphere, causing a temporary decrease in global temperatures of 0.5°C (0.9°F).

The eruption also had a major impact on the local population. More than 800 people were killed, and tens of thousands were left homeless. The eruption destroyed more than 200 villages and caused billions of dollars in damage.

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David Denton

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