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Weather is notoriously unpredictable; however, climate descriptions, which identify average and normal temperatures and precipitation levels, tend to be perceived as stable, at least over time scales that humans can easily relate to. New evidence suggests that hasn't always been the case. This video segment describes climate data, obtained from ice cores drilled into the Greenland Ice Sheet, that suggest the Earth has undergone dramatic climate shifts in relatively short spans of time. The segment is five minutes forty-eight seconds in length. A background essay and discussion questions are included.
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