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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.
Best Answer: most abundant gas in the earth's atmosphere is nitrogen bcoz Nitrogen makes up 78% of the earth's atmosphere. The answer lies mostly in three facts: 1. nitrogen is volatile in most of its forms. 2. it is unreactive with materials that make up the solid earth. 3. it is very stable in the presence of solar radiation.