Multiple Choice
According to readings from the Mauna Loa Observatory,CO2 concentrations in May 2013 exceeded which of the following for the first time during the last 800 000 years?
A) 100-ppm.
B) 200-ppm.
C) 300-ppm.
D) 400-ppm.
Correct Answer:
Verified
Correct Answer:
Verified
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