Multiple choice

Which of the following is NOT a possible cause of global warming?

  1. increased levels of carbon dioxide in the atmosphere

  2. increase in greenhouse gases in the atmosphere

  3. decreased levels of carbon dioxide in the atmosphere

  4. increased air pollution from human activity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Global warming is driven by the greenhouse effect, which is caused by an increase in greenhouse gases like carbon dioxide. Decreasing carbon dioxide levels would theoretically have the opposite effect.

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