 Examples of past abrupt global climate changes before CO2 began to rise in 1945  Sudden warming 15,000 yrs ago at end of the Ice Age  Dansgard-Oerscher events—Rapid warming in decades  13 Dansgaard-Oeschger events occurred between 11,600 and 45,000 years ago  Younger Dryas -- Sudden warming 11,500 years ago -- 5°C over 30-40 years and ~8°C over 40 years.
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