Greenhouse gas
From Emissions Wiki
Greenhouse gases (GHGs) are gaseous components of the atmosphere that contribute to the greenhouse effect. Like greenhouse glass, greenhouse gases are transparent only to some wavelengths of light. When sunlight hits the Earth, some is absorbed and re-emitted at longer wavelengths for which the greenhouse gas is opaque, hindering emission back out into space.
The major natural greenhouse gases are water vapor, which causes about 36-70% of the greenhouse effect on Earth (not including clouds), but that can be converted to rain by nature; carbon dioxide, which causes between 9-26%; methane, which causes 4-9%, and ozone, which causes between 3-7%. (note that it is not really possible to assert that such-and-such a gas causes a certain percentage of the greenhouse effect, because the influences of the various gases are not additive.)
Other greenhouse gases include, but are not limited to: nitrous oxide, sulfur hexafluoride, hydrofluorocarbons, perfluorocarbons and chlorofluorocarbons - see IPCC list of greenhouse gases.
