A substance in gazeous form that is often found in high concentrations in the atmosphere.
Example(s):
[EN] Fossil fuels, which we burn to provide power and transport, are a particular culprit, releasing into the atmosphere GASES such as carbon dioxide
(CO2) which warm the Earth's surface.
[FR] Bien qu'il y ait moins de MÉTHANE que de DIOXYDE DE CARBONE dans l'atmosphère, le méthane est un
gaz à effet de serre qui retient plus efficacement la chaleur. (Source : 3CANADAENVIRON)