I may be wrong but I was under the impression that any gas molecule with more than 2 atoms contributes to the greenhouse effect. I don't think there's currently much ammonia in the Earth's atmosphere but if we started producing it in large quantities wouldn't it also cause warming, just like CO2 and CH4 ?
You might be right. I was thinking compared to HFCs (like Freon) damaging the ozone layer.
Interestingly even after the so many years of banning some HFCs, there is a healthy black market in some places. People have stored it in hopes the prices will rise. And they did rise. Some installations were reliable enough and worked using older stuff and owners never upgraded. So those owners would rather pay black market prices for it.
Last I heard, some governments were providing incentives (using the carrot approach) instead of just the stick, to upgrade older systems to safer compounds.
