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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.
Carbon dioxide was the most abundant gas in the early atmosphere but now it is nitrogen which is about 71%. The other gases that are in the air are oxygen which is approximate â¦ ly 20%, carbon dioxide which is 0.04%, argon (noble gas) which is 0.9% and water vapour.