-How much higher is atmospheric CO₂concentration at Mauna Loa Observatory in 2015 than it was in 1960? A)80% higher B)Twice as high C)Four times higher D)25% higher

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The Answer of -How much higher is atmospheric CO₂concentration at Mauna Loa Observatory in 2015 than it was in 1960? A)80% higher B)Twice as high C)Four times higher D)25% higher

-How Much Higher Is Atmospheric CO2 concentration at Mauna Loa

-How Much Higher Is Atmospheric CO₂concentration at Mauna Loa