My point is even the best refrigerant powered by coal or even "rando outlet power on average" is less green than the worst Peltier cooler powered by a solar pan

My point is even the best refrigerant powered by coal or even "rando outlet power on average" is less green than the worst Peltier cooler powered by a solar panel. So as per OPs original claim that if we ban every chemical more hazardous than distilled water we can have no refrigeration is not entirely true, we can in theory redesign the entire system around not using any refrigerants. It would be an environmental disaster if not powered by solar, or maybe wind, of course, but it would technically work.