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The Younger Dryas was a period of dramatic cooling on Earth that was a brief reversal of the warming trend coming out of the last glacial maximum 20,000 years ago. Starting around 11,000 years ago, during the warming, there was an abrupt cooling that lasted ~700 years and led to enormous but short-lived changes in the climate of Northern Europe. These changes were first noted in the pollen records from lake sediments, which indicated a change-over from forests to cold-adapted herbaceous plants (such as Dryas, a plant that thrives on arctic and alpine tundra) and back to forest again. In the early 1980's, evidence for the Younger Dryas was obtained from CO2 ice-core bubble measurements and confirmed that it was an event of global significance (since carbon dioxide is well-mixed throughout the global atmosphere).
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