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"NOAA/ESRL Global Monitoring Division - THE NOAA ANNUAL GREENHOUSE GAS INDEX (AGGI)." NOAA/ESRL Global Monitoring Division - THE NOAA ANNUAL GREENHOUSE GAS INDEX (AGGI). National Oceanic and Atmospheric Administration, n.d. Web. 31 May 2016. http://www.esrl.noaa.gov/gmd/aggi/.

Calculate the average rate of increase in methane concentration from 1980 to 2015 using the graph above.

A

35 ppb/year

B

270 ppb/year

C

1.1 ppb/year

D

7.6 ppb/year

E

15.2 ppb/year

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