is not a Greenhouse gas oxygen carbon dioxide Methane ozone
Answers
oxygen
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The definition of a greenhouse gas is at the same time very simple and very complicated for the ordinary man (or woman !) : such a gaz is “just” a gas mixed in the atmosphere that absorbs the infrared radiation emitted by the earth’s surface. We are not accustomed to these gases because neither nitrogen nor oxygen, the two most abundant gases of the atmosphere (78% and 21%, respectively), that many of us have heard of, have this ability to intercept infrared radiation. But once this is said, what are these gases exactely ? And are we the sole emitters for these gases ?
The “natural” greenhouse gases
The two main gases responsible for the greenhouse effect (and not noly its recent increase) are :
Water vapour (H2O),
carbon dioxyde (CO2).
There are others such gases, and even many others. Some of them are “natural”, which means that they were present in the atmosphere before the apparition of men, and other can be called “artificial”, in the sense that they are present in the atmosphere only because of us.
Beyond water and CO2, the other important “natural” greenhouse gases are :
methane (CH4), which is nothing else than the cooking gas we use in our stoves,
Nitous oxyde (N2O), the scholarly name for….. laughing gas (which is not so much amusing here),
ozone (O3), which molecule comprises 3 oxygen atoms (the molecules of the “regular” oxygen gas have only 2 atoms of oxygen).
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