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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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4 votes
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 VincentQT
by
6.9k points

2 Answers

4 votes
Carbon dioxide i am think 
User Peer
by
8.0k points
5 votes
                                   its carbon dioxide that has risen
User Jonathan March
by
7.1k points
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