It is thought that the concentration of CO2 in the year 1890 was around:
Correct answer: B. 275 ppm
- A. 245 ppm
- B. 275 ppm
- C. 215 ppm
- D. 230 ppm
Explanation
Atmospheric carbon dioxide in the late nineteenth century was approximately 275 ppm, close to the pre-industrial level of about 280 ppm. The other values are substantially lower and do not fit historical estimates.
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