The projected most common modern one is propane, which sounds bad, but is about a thousand times less than our old ones. The amount of propane in an AC is also negligible compared to what even the smallest appliance that burns it would put out, by the simple fact that it is reused for the life of the AC.
As long as an AC is disposed of properly, which is far more likely to be done by someone who cares about their footprint, there’s no issue.
The projected most common modern one is propane, which sounds bad, but is about a thousand times less than our old ones. The amount of propane in an AC is also negligible compared to what even the smallest appliance that burns it would put out, by the simple fact that it is reused for the life of the AC.
As long as an AC is disposed of properly, which is far more likely to be done by someone who cares about their footprint, there’s no issue.
I actually like that the landfills in my area specifically won’t take refrigerators or air conditioners.