It is thought that the concentration of CO2 in the year 1890 was around:

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A245 ppm

B230 ppm

C275 ppm

D215 ppm

Correct answer

C. 275 ppm

Explanation

The correct answer is 275 ppm.

It is thought that the concentration of CO2 in the year 1890 was around: - Answer and Explanation | Academy of Pakistan