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I did not say that N2O is not a greenhouse gas. That's presuming that I use your definition, which is a form of begging the question.

But anyway, there is reason for this misunderstanding, I see, because there sometimes is a broader and sometimes a narrower use of the symbol.

Nitrogen oxide - Wikipedia, the free encyclopedia

NOx is a generic term for mono-nitrogen oxides (NO and NO2). These oxides are produced during combustion, especially combustion at high temperatures.

Nitrogen Oxides: Health and Environmental Impacts of NOx | Six Common Pollutants | Air & Radiation | US EPA
NOx causes a wide variety of health and environmental impacts because of various compounds and derivatives in the family of nitrogen oxides, including nitrogen dioxide, nitric acid, nitrous oxide, nitrates, and nitric oxide.

At any rate, nitrous oxide (N2O) is not produced in vast quantities as an emission of internal combustion engines, that is NO and NO2, which are not greenhouse gases. Older catalysts meant to reduce those do produce some N2O. The main sources are industrial processes and agriculture.
by nanne (zwaerdenmaecker@gmail.com) on Thu Nov 20th, 2008 at 03:59:35 AM EST
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