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Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest? water vapor methane fluorinated gas carbon dioxide

User Dlf
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I believe the answer is Carbon dioxide, please correct me if I am wrong!

Thank you.

-PiggyPig
User Tomasz Ferfecki
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The answer is carbon dioxide. Carbon dioxide (CO2) covers approximately 75% of the heating effect of current greenhouse gas emissions. This is basically produced by burning coal and oil, and deforestation is also a very important contributor.
User KarateJB
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