Multiple choice general knowledge science & technology

How much Carbon dioxide (CO2) is in Earth's atmosphere today?

  1. 10% or greater

  2. 2% to 10%

  3. Less than 1/10th of 1%

  4. Approx 3%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

CO2 constitutes approximately 0.04% (400 ppm) of Earth's atmosphere, which is far less than 1%. Despite this small concentration, it is a critical greenhouse gas that has increased significantly due to human activities.

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