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"The Proof Is in the Atmosphere." The Proof Is in the Atmosphere. U.S. EPA, n.d. Web. 28 Mar. 2016. https://www3.epa.gov/climatechange/kids/scientists/proof.html.

According to the graph above, current atmospheric carbon dioxide levels are now ____% higher than any time period in the last 700,000 years.

A

12

B

55

C

27

D

3

E

92

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