Physics, 30.12.2019 16:31, jessicawelch25

Which statement below is the most accurate description of carbon dioxide levels in the atmosphere over the past few decades?
a. carbon dioxide levels have remained the same.
b. carbon dioxide levels have decreased.
c. carbon dioxide levels have increased.
d. carbon dioxide levels cannot be measured.

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Which statement below is the most accurate description of carbon dioxide levels in the atmosphere ov...