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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.
We know that nitrogen (at about 78%) and oxygen (at about 20 %) are the most abundant gases in the atmosphere.By inspection, it's obvious that there is only a couple of perce â¦ nt for all the other gases combined.e know that nitrogen (at about 78%) and oxygen (at about 20 %) are the most abundant gases in the atmosphere.