Green house gases are emitted by all animal life. All animal life, including human, would have to die for CO2 emissions to be ceased and then decay processes would emit CO2 anyway so I suppose you have to figure out how to destroy all bacteria as well. The ozone layer hasn't been demonstrated to be damaged in any significant way. The ban on freon was precautionary to avoid potential damage in the future. It has nothing to do with GHG emissions. It involved chloroflorocarbons (CFCs), not greenhouse gases (GHGs). I suspect the ban on CFCs was probably misguided by exaggeration and bad science but it is done and isn't as potentially catastrophic as the solutions proposed to mitigate GHG emissions.
I remember reading that that there were about one in 8 billion molecules in the upper atmosphere that were CFC. This means that if you had 80,000 stadiums each filled with 100,000 people, one person in all of those stadiums represents that CFC molecule. That would be stadiums of people lined from the Atlantic to the Pacific. This lonely molecule is supposed to affect all those ozone molecules and you have to realize that ozone is very short lived anyway. My BS buzzer was going off big time on that one but it is a leftist cause and as such is seldom challenged by the sycophants that believe what they are told to believe.