Whoever thought climate change can only happen slowly, perhaps over decades, might be surprised (as I was) by revelations from a mud core extracted from an ancient lake in western Ireland. Thin slices of the core suggest that the Younger Dryas mini ice age of around 12,800 years ago took hold in just months, a year at most.
(see 'Ice age took hold in less than a year', New Scientist, 14 November 2009, p10)
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