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    Scientific American Environmental Study Set 1
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    Exam 21: Climate Change- When the Trees Leave: Scientists Grapple With a Shifting Climate- Alternatives to Fossil Fuels
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    What Causes the Level of Atmospheric CO₂ to Rise and Fall
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What Causes the Level of Atmospheric CO₂ to Rise and Fall

Question 39

Question 39

Multiple Choice

What causes the level of atmospheric CO₂ to rise and fall throughout the year?


A) plant growth and dormancy due to seasons
B) temperature fluctuation
C) movement of ocean air streams
D) industry booms
E) relative distance of Earth to the Sun

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