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It was a Volcano and it changed world temperatures for 3 years according to the U.S. Geological Survey Cascades Volcano Observatory


Nearly 20 million tons of sulfur dioxide were injected into the stratosphere in Pinatubo's 1991 eruptions, and dispersal of this gas cloud around the world caused global temperatures to drop temporarily (1991 through 1993) by about 1°F (0.5°C).

http://pubs.usgs.gov/fs/1997/fs113-97/

Volcanos
Cow farts
fires
Swamp gas

For 12,500 years glaciers have been retreating

Give the left a satellite image and they believe they have discovered the end of the world. :)

Bears
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