In June 1991, what caused the earth's surface temperatures to drop by one degree?
A gllobal volcanic haze, flung into the stratosphere by the eruption of Mount Pinatubo in the Philippines in June 1991, has turned the sky in some places from blue to milky white as it scatters the sun's rays.
Preliminary data show that the Mount Pinatubo haze has caused a drop in the average surface temperature of the earth of as much as 1 degree Fahrenheit and a drop in the Northern Hemisphere of up to 1.5 degrees.
http://www.nytimes.com/1992/08/04/scien … lcano.html
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