It is thought that the concentration of CO2 by the year 2040 shall reach:
Correct answer: D. 450 ppm
- A. 400 ppm
- B. 500 ppm
- C. 475 ppm
- D. 450 ppm
Explanation
Many standard environmental projections estimated atmospheric CO2 at about 450 ppm by 2040, compared with roughly 280 ppm before industrialisation. The exact value depends on the emissions scenario, but 450 ppm is the intended textbook estimate.
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