Multiple choice general knowledge

What is known as the 2nd green house gas

  1. methane

  2. sulfer

  3. carbon dioxide

  4. oxygen
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A Correct answer
Explanation

After carbon dioxide (the most abundant anthropogenic greenhouse gas), methane is considered the second most significant greenhouse gas due to its high global warming potential - about 28 times more effective than CO2 at trapping heat over 100 years. Sulfur is not a greenhouse gas, and oxygen is not a greenhouse gas at all.

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