A greenhouse gas GHG or GhG is a gas that absorbs and emits radiant energy in the. The use of a glass greenhouse to illustrate the greenhouse effect is only appropriate at a coarse end result level not as an actual model of how the CO2-induced GHE actually works. Greenhouse Gases The Carbon Cycle Web Notes Carbon Cycle Greenhouse Gases Science Notes In reality gases absorb IR light selectively and most of the gas in the atmosphere doesnt interact with IR light at all. . John Tyndall was the first to measure the infrared absorption and emission of various gases and vapors. Trapping heat in the atmosphere and making the Earth warmer. Earths surface warms up in the sunlight. Without them our planet would be too cold and life as we know it would not exist. Among the following the one that is not a greenhouse gas is. It also does not stay in one place it moves around and combines with other green house gases. G...