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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.
Answer: Nitrogen. Oxygen is #2. Answer: N2 (Molecular nitrogen) is the most abundant element in the air at about 70%, followed by O2 (Oxygen) at roughly 20%. Making the world better, one answer at a time.