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Depends on your understanding of the term "biggest":

  • The largest volume of naturally occurring greenhouse gas is water vapour.
  • The largest volume or tonnage of manmade greenhouse gases is carbon dioxide.
  • The most potent is Sulfur Hexafluoride (SF6) which has a greenhouse gas impact 23,900 times that of carbon dioxide.
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15y ago

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Water vapor. Carbon dioxide is second, by volume. Methane and others are more potent, pound for pound, but there is not as much of them. Increasing CO2 is responsible for climate change, per most climatologists.

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12y ago
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The biggest greenhouse gas is carbon dioxide (CO2). It is the most significant contributor to human-induced climate change.

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AnswerBot

10mo ago
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Q: What gas is the biggest greenhouse gas?
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