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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.
Fortunately, HowStuffWorks explains that nitrogen is plentiful on Earth. When not bound to other elements, nitrogen forms a colorless, tasteless, odorless gas. Nitrogen is the most abundant element in the atmosphere, representing nearly 78 percent of the atmospheric volume and 75 percent of the atmospheric weight.