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By how much did carbon dioxide levels increase from 1980 to 2000? A.22 ppm B.32 ppm C.45 ppm D.51 ppm
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4 votes
By how much did carbon dioxide levels increase from 1980 to 2000?

A.22 ppm
B.32 ppm
C.45 ppm
D.51 ppm

User Benhameen
by
5.6k points

1 Answer

0 votes
c. 45 ppm I believe :D
User Sam Beckham
by
6.2k points
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