How Much Has Atmospheric CO₂ Increased in Approximately the Last

question 32

Multiple Choice

How much has atmospheric CO₂ increased in approximately the last 50 years,according to the record for Hawaii's Mauna Loa observatory,in the figure below?

• A)from about 220 to 320 ppm (parts per million)
• B)from about 360 to 400 ppm
• C)from about 320 to 400 ppm
• D)from about 220 to 400 ppm

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