Some 20,000 years ago, the Earth wobbled on its axis. That happens periodically. But according to a new scenario, this particular time, that wobble sparked a chain reaction of events that melted glaciers and led to a gradual warming of the planet.
Source: http://www.npr.org/2012/04/05/150000446/shake-it-off-earth-s-wobble-may-have-ended-ice-age?ft=1&f=1007
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