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Question: During the past 150 years the concentration of CO<sub>2</sub> has increased approximately from –...

During the past 150 years the concentration of CO2 has increased approximately from –

A

200 ppm to to 300 ppm

B

120 ppm to 280 ppm

C

280 ppm to 370 ppm

D

350 ppm to 450 ppm

Answer

350 ppm to 450 ppm