A single eruption cooled the whole planet.

1991

After the Philippines' Mount Pinatubo blew in 1991, a sulphuric haze spread around the Earth and global temperatures fell by about 0.5 °C in 1991–1993.

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The event

• Eruption of Mount Pinatubo1991 · Luzon, Philippines. On 15 June 1991 came the second-largest eruption of the 20th century. Forecasts allowed tens of thousands to be evacuated, but a passing typhoon turned the ash into heavy mud that collapsed roofs. Global temperatures fell by about half a degree for two years.

20th century

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