Greenhouse gas, any gas that has the property of absorbing emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to the green house effect. carbon dioxide and methane and water vapour are the most important greenhouse gases. (To a lesser extent, surface-level fluorinated gases also trap infrared radiation.) Greenhouse gases have a profound effect on the energy. budget of the Earth system despite making up only a fraction of all atmospheric gases. Concentrations of greenhouse gases have varied substantially during Earth’s history, and these variations have driven substantial climate changes. at a wide range of timescales. In general, greenhouse gas concentrations have been particularly high during warm periods and low during cold periods.
-Answered by Himanshi Verma On 21 April 2019:10:39:54 AM