According to the Figure Below,how Much Has Atmospheric Carbon Dioxide

question 50

Multiple Choice

According to the figure below,how much has atmospheric carbon dioxide (CO₂) increased in parts per million (ppm) in approximately the last 50 years?

• A) from about 310 to 320 ppm
• B) from about 360 to 400 ppm
• C) from about 320 to 400 ppm
• D) from about 380 to 400 ppm

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