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

question 1

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

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