According to Readings from the Mauna Loa Observatory,CO₂ Concentrations in May

question 56

Multiple Choice

According to readings from the Mauna Loa Observatory,CO₂ concentrations in May 2013 exceeded_________ for the first time during the last 800,000 years.

• A)100-ppm
• B)200-ppm
• C)300-ppm
• D)400-ppm

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