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According to scientific data on climate change, what levels have risen by 30% over the past 200 years? A. ozone B. argon C. carbon dioxide D. krypton
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According to scientific data on climate change, what levels have risen by 30% over the past 200 years?

A. ozone
B. argon
C. carbon dioxide
D. krypton

User Walden Leverich
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1 Answer

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Carbon dioxide levels have risen over the past 200 years. The change has been a whole lot more than 30%.
User Soojoo
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