Why is carbon dioxide the gold standard in greenhouse emissions - and not nitrous oxide? I admit that this is not a genuinely earth sience question, but since there is no stack exchange site genuinely devoted to general ecology, I dare to ask it here:

From a table in the German Wikipedia article on emissions trading I've learned that the global warming potential of nitrous oxide is 298 times as high as that of carbon dioxide, and that it makes 7.9% of the humans caused greenhouse gases:



Given these numbers nitrous oxide seems to contribute roughly 30 times more heavily to climate change than carbon dioxide does.

Why is nevertheless carbon dioxide the gold standard of greenhouse gases and humans caused climate change?
There isn't enough nitrous oxide in the atmosphere to make a major contribution to global warming, which in some ways is a pity, because we'd all bee in a much jollier mood if there was (N2O is sometimes known as laughing gas). It also depletes the ozone layer if it gets up that high, though depleting ozone at ground level, where it is harmful, is a good thing. Compared to N2O, there are vast quantities of CO2 in the atmosphere, enough to create millions of tons of wood and other plant materials every year. The whereabouts of N2O in the atmosphere, whether it is high up or low down, probably has some bearing on the matter.