Why is Carbon Dioxide a Greenhouse Gas whereas Ammonia is not?
This is better suited for the Chemistry site, but there are two reasons.  1) The gas allows visible light to pass, but blocks infrared.  (Which has to do with the nature of the bonds between atoms &amp;c.) 2) It exists in the atmosphere in sufficient quantity to have an effect, which ammonia doesn't: https://www.livescience.com/57305-ammonia-detected-in-atmosphere.html  It's quite reactive, so ammonia that's released from e.g. fertilizers or urine doesn't stay around long.