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The Keeling Curve zigzags due to seasonal fluctuations in atmospheric carbon dioxide (CO2) levels, primarily driven by the growth and decay of vegetation in the Northern Hemisphere. During spring and summer, plants absorb CO2 for photosynthesis, causing levels to drop, while in fall and winter, decay and reduced photosynthesis lead to an increase in CO2. This pattern results in a cyclical rise and fall, superimposed on the overall upward trend of CO2 concentrations due to human activities.

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AnswerBot

1mo ago

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