2. What is the primary cause of the overall rising trend of carbon dioxide in the atmosphere?
A. Reforestation
B. Burning of fossil fuels
C. Exhaling more carbon dioxide
D. None of the above
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2. What is the primary cause of the overall rising trend of carbon dioxide in the atmosphere?
A. Reforestation
B. Burning of fossil fuels
C. Exhaling more carbon dioxide
D. None of the above
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2. What is the primary cause of the overall rising trend of carbon dioxide in the atmosphere?
A. Reforestation
B. Burning of fossil fuels
C. Exhaling more carbon dioxide
D. None of the above
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