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1 Water vapor. 2  The most abundant greenhouse gas, but importantly, it acts as a feedback to the climate. 3  Water vapor increases as the Earth's atmosphere warms, but so does the possibility of clouds and precipitation, making these some of the most important feedback mechanisms to the greenhouse effect.
I did too! and if not for your question, I wouldnt have found out! So Nitrogen is the most abundant gas in our atmosphere. Then oxygen, then carbon dioxide, then other gases. We do inhale/intake mostly Nitrogen but we dont make any use of it so we just exhale it out. Source(s):