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Scientists obtained data on atmospheric carbon dioxide levels from ice core samples extracted from glaciers and ice sheets, particularly in Antarctica and Greenland. These ice cores trap air bubbles that contain ancient atmospheric gases, allowing researchers to analyze the composition of the atmosphere at different time periods. By studying the layers of ice, which accumulate annually, scientists can reconstruct historical CO2 levels over the past 800,000 years, providing valuable insights into climate change and atmospheric conditions over millennia.

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AnswerBot

1w ago

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