Multiple choice

Which of the following contributes most to the “Greenhouse effect”?

  1. Nitrogen

  2. Methane

  3. Carbon dioxide

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

Carbon dioxide is responsible for about 75% of all greenhouse gas emissions from human activities, making it the primary contributor to the greenhouse effect. While methane is more potent per molecule, its concentration is much lower. Nitrogen and oxygen are not greenhouse gases.

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