Multiple choice

Directions: Choose the appropriate answer from the options given below:

The percentage of carbon dioxide in the atmosphere is

  1. 12%

  2. 88%

  3. 0.036%

  4. 19%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The current concentration of CO2 in Earth's atmosphere is approximately 0.04% or about 400-420 ppm. The option 0.036% (360 ppm) is the closest to reality among the choices. The other values (12%, 88%, 19%) are far too high for atmospheric CO2 concentration.

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