Multiple Choice
The "Keeling curve" showing CO2 measurements at Mauna Loa, Hawaii, shows that concentrations of CO2 have reached approximately what level, in parts per million (PPM) ?
A) 1,000 ppm
B) 400 ppm
C) 350 ppm
D) 200 ppm
E) 100 ppm
Correct Answer:
Verified
Correct Answer:
Verified
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