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How Much Has Atmospheric CO₂ Increased in Approximately the Last

Question 52

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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? 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 310 to 390 ppm D) from about 220 to 400 ppm


A) from about 220 to 320 ppm (parts per million)
B) from about 360 to 400 ppm
C) from about 310 to 390 ppm
D) from about 220 to 400 ppm

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