Greenhouse gases

In order of volume, Earth's most abundant greenhouse gases are:

* water vapor
* carbon dioxide
* methane
* nitrous oxide
* ozone
* CFCs
By their percentage contribution to the greenhouse effectthe four major gases are:
* water vapor, 36–70%
* carbon dioxide, 9–26%
* methane, 4–9%
* ozone, 3–7%
The major non-gas contributor to the Earth's greenhouse effect, clouds, also absorb and emit infrared radiation and thus have an effect on radiative properties of the atmosphere