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The "Keeling Curve" Showing CO2 Measurements at Mauna Loa,Hawaii,shows That

Question 8

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:

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