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The most abundant greenhouse gas is water vapor. Although not as potent as other greenhouse gases pound for pound, by sheer volume water vapor is the key greenhouse gas.

Carbon dioxide is the second largest (by volume) greenhouse gas. Methane and nitrous oxide complete the four primary greenhouse gases, but there are only trace amounts of these in our atmosphere. Since water vapor is about 4% of the atmosphere, and CO2 concentrations are 400 parts per million, 0.04/0.0004 = 1%. In other words, CO2 is roughly 1% of the greenhouse gas.

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Q: What percentage does co2 contribute to green house gases?
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